{"id":12894,"date":"2026-04-21T00:53:56","date_gmt":"2026-04-21T00:53:56","guid":{"rendered":"https:\/\/hlh-js.com\/?p=12894"},"modified":"2026-04-21T00:53:56","modified_gmt":"2026-04-21T00:53:56","slug":"sandblasting-material-for-automotive-restoration-remove-paint-without-warping","status":"publish","type":"post","link":"https:\/\/hlh-js.com\/de\/resource\/blog\/sandblasting-material-for-automotive-restoration-remove-paint-without-warping\/","title":{"rendered":"Sandblasting Material for Automotive Restoration: Remove Paint Without Warping"},"content":{"rendered":"<style>\n@import url('https:\/\/fonts.googleapis.com\/css2?family=Barlow:wght@400;500;600;700&family=Barlow+Condensed:wght@600;700&display=swap');\n.hlh-l2*,.hlh-l2*::before,.hlh-l2*::after{box-sizing:border-box;margin:0;padding:0}\n.hlh-l2{font-family:'Barlow',sans-serif;font-size:17px;line-height:1.75;color:#1e2228;background:#fff;max-width:860px;margin:0 auto}\n.hlh-l2 h1{font-family:'Barlow Condensed',sans-serif;font-size:clamp(1.9rem,5vw,2.8rem);font-weight:700;line-height:1.15;color:#0d1117;margin-bottom:1.2rem}\n.hlh-l2 h2{font-family:'Barlow Condensed',sans-serif;font-size:clamp(1.3rem,3.5vw,1.8rem);font-weight:700;color:#0d1117;margin:2.8rem 0 1rem;padding-top:2rem;border-top:2px solid #e8ebf0}\n.hlh-l2 h3{font-size:1.1rem;font-weight:600;color:#1a2232;margin:1.6rem 0 0.5rem}\n.hlh-l2 p{margin-bottom:1.1rem;color:#2c3340}\n.hlh-l2 a{color:#c84b0e;text-decoration:none;border-bottom:1px solid rgba(200,75,14,0.3)}\n.hlh-l2 a:hover{color:#a33a08}\n.hlh-l2 ul,.hlh-l2 ol{padding-left:1.4rem;margin-bottom:1.1rem}\n.hlh-l2 li{margin-bottom:0.4rem;color:#2c3340}\n.l2-hero{background:linear-gradient(135deg,#10080a 0%,#201018 50%,#100808 100%);border-radius:10px;padding:3rem 2.5rem;margin-bottom:2.5rem;position:relative;overflow:hidden}\n.l2-hero::before{content:'';position:absolute;top:-20px;right:-20px;width:200px;height:200px;border-radius:50%;background:rgba(200,75,14,0.15);filter:blur(40px)}\n.l2-hero h1{color:#fff;margin-bottom:1rem}\n.l2-hero p.l2-lead{color:rgba(255,255,255,0.78);font-size:1.08rem;max-width:620px;margin-bottom:1.5rem}\n.l2-hero-meta{display:flex;gap:1.5rem;flex-wrap:wrap}\n.l2-hero-meta span{font-size:0.82rem;color:rgba(255,255,255,0.5)}\n.l2-company-tag{font-size:0.8rem;color:rgba(220,160,130,0.7);text-transform:uppercase;letter-spacing:0.8px;font-weight:600;margin-bottom:0.4rem}\n.l2-toc{background:#f5f7fa;border:1px solid #e2e6ec;border-left:4px solid #c84b0e;border-radius:8px;padding:1.5rem 1.8rem;margin:0 0 2.8rem}\n.l2-toc-title{font-family:'Barlow Condensed',sans-serif;font-size:1rem;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:#0d1117;margin-bottom:0.85rem}\n.l2-toc ol{padding-left:1.2rem;margin:0}\n.l2-toc li{margin-bottom:0.35rem;font-size:0.93rem}\n.l2-toc a{color:#2c4a7a;border-bottom:none;font-weight:500}\n.l2-box{border-radius:8px;padding:1.3rem 1.5rem;margin:1.8rem 0}\n.l2-box-key{background:#fff8f5;border:1px solid #f5c8b0;border-left:4px solid #c84b0e}\n.l2-box-note{background:#f0f4ff;border:1px solid #c5d3f0;border-left:4px solid #2c5db3}\n.l2-box-warn{background:#fffbf0;border:1px solid #f0dcaa;border-left:4px solid #d4880a}\n.l2-box-green{background:#f0faf4;border:1px solid #a0d8b0;border-left:4px solid #1a7a40}\n.l2-box-title{font-weight:700;font-size:0.9rem;text-transform:uppercase;letter-spacing:0.5px;margin-bottom:0.5rem}\n.l2-box-key .l2-box-title{color:#c84b0e}\n.l2-box-note .l2-box-title{color:#2c5db3}\n.l2-box-warn .l2-box-title{color:#b07308}\n.l2-box-green .l2-box-title{color:#1a7a40}\n.l2-box p{color:#2c3340;margin-bottom:0}\n.l2-substrate-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin:1.5rem 0 2rem}\n.l2-substrate-card{background:#fff;border:1px solid #e2e6ec;border-radius:10px;padding:1.3rem;position:relative;overflow:hidden}\n.l2-substrate-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px}\n.l2-sc-steel::before{background:#4a4a5a}\n.l2-sc-aluminum::before{background:#2c5db3}\n.l2-sc-fiber::before{background:#1a7a40}\n.l2-sc-engine::before{background:#8a6000}\n.l2-substrate-card h3{font-size:0.97rem;margin-top:0;margin-bottom:0.5rem;color:#0d1117}\n.l2-substrate-card .sc-media{font-size:0.88rem;font-weight:600;color:#c84b0e;margin-bottom:0.5rem;display:block}\n.l2-substrate-card .sc-why{font-size:0.85rem;color:#4a5568;line-height:1.5;margin-bottom:0.5rem}\n.l2-substrate-card .sc-avoid{font-size:0.82rem;color:#a32020;background:#fdf0f0;padding:4px 8px;border-radius:4px;display:inline-block}\n.l2-table-wrap{overflow-x:auto;margin:1.5rem 0 2rem;border-radius:8px;border:1px solid #e2e6ec}\n.l2-table{width:100%;border-collapse:collapse;font-size:0.87rem;min-width:560px}\n.l2-table thead th{background:#201018;color:#fff;padding:11px 13px;text-align:left;font-weight:600;white-space:nowrap}\n.l2-table thead th:first-child{border-radius:8px 0 0 0}\n.l2-table thead th:last-child{border-radius:0 8px 0 0}\n.l2-table tbody tr:nth-child(even){background:#f9fafb}\n.l2-table tbody td{padding:10px 13px;border-bottom:1px solid #e8ebf0;color:#2c3340;vertical-align:top}\n.l2-table tbody tr:last-child td{border-bottom:none}\n.l2-process-steps{margin:1.5rem 0}\n.l2-process-step{display:flex;gap:1.2rem;margin-bottom:1.6rem;align-items:flex-start}\n.l2-process-num{flex-shrink:0;width:40px;height:40px;background:#c84b0e;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:'Barlow Condensed',sans-serif;font-weight:700;font-size:1rem}\n.l2-process-body h3{margin-top:4px;margin-bottom:0.3rem;font-size:1rem;color:#0d1117}\n.l2-process-body p{font-size:0.92rem;color:#4a5568;margin-bottom:0}\n.l2-faq-item{border:1px solid #e2e6ec;border-radius:8px;overflow:hidden;margin-bottom:10px}\n.l2-faq-q{width:100%;text-align:left;background:#f9fafb;border:none;cursor:pointer;padding:1rem 1.3rem;font-family:'Barlow',sans-serif;font-size:0.97rem;font-weight:600;color:#0d1117;display:flex;justify-content:space-between;align-items:center;gap:12px}\n.l2-faq-q:hover{background:#f0f2f5}\n.l2-faq-icon{flex-shrink:0;width:20px;height:20px;border-radius:50%;background:#e2e6ec;display:flex;align-items:center;justify-content:center;font-size:1rem;color:#4a5568}\n.l2-faq-a{display:none;padding:0 1.3rem 1rem;font-size:0.93rem;color:#2c3340;line-height:1.7;background:#fff}\n.l2-faq-item.open .l2-faq-a{display:block}\n.l2-faq-item.open .l2-faq-icon{background:#c84b0e;color:#fff}\n.l2-related{background:#f5f7fa;border:1px solid #e2e6ec;border-radius:10px;padding:1.6rem 1.8rem;margin:2.5rem 0}\n.l2-related-title{font-family:'Barlow Condensed',sans-serif;font-size:1.1rem;font-weight:700;color:#0d1117;margin-bottom:1rem}\n.l2-related ul{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:8px}\n.l2-related ul li a{display:flex;align-items:flex-start;gap:8px;font-size:0.88rem;font-weight:500;border-bottom:none;color:#1a2232;padding:8px 10px;border-radius:6px;background:#fff;border:1px solid #dde2ea;transition:border-color 0.2s,color 0.2s}\n.l2-related ul li a:hover{border-color:#c84b0e;color:#c84b0e}\n.l2-related ul li a span{color:#c84b0e;flex-shrink:0}\n.l2-cta-pair{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:3rem 0 2rem}\n@media(max-width:560px){.l2-cta-pair{grid-template-columns:1fr}}\n.l2-cta{border-radius:10px;padding:1.6rem 1.8rem;display:flex;flex-direction:column}\n.l2-cta-primary{background:linear-gradient(135deg,#c84b0e,#e05c1a)}\n.l2-cta-secondary{background:#f5f7fa;border:1px solid #dde2ea}\n.l2-cta h3{font-family:'Barlow Condensed',sans-serif;font-size:1.2rem;font-weight:700;margin-bottom:0.5rem;margin-top:0}\n.l2-cta-primary h3,.l2-cta-primary p{color:#fff}\n.l2-cta-secondary h3{color:#0d1117}\n.l2-cta p{font-size:0.9rem;margin-bottom:1.2rem;flex:1}\n.l2-cta-secondary p{color:#4a5568}\n.l2-btn{display:inline-block;padding:10px 22px;border-radius:6px;font-weight:700;font-size:0.9rem;text-decoration:none;border-bottom:none!important;align-self:flex-start}\n.l2-btn-white{background:#fff;color:#c84b0e}\n.l2-btn-dark{background:#0d1117;color:#fff}\n.l2-divider{border:none;border-top:1px solid #e2e6ec;margin:2.5rem 0}\n<\/style>\n\n<div class=\"hlh-l2\">\n<div class=\"l2-hero\">\n  <p class=\"l2-company-tag\">Jiangsu Henglihong Technology Co, Ltd.<\/p>\n  <h1>Sandblasting Material for Automotive Restoration: Remove Paint Without Warping<\/h1>\n  <p class=\"l2-lead\">A complete substrate-by-substrate guide to sandblasting media selection for automotive restoration \u2014 covering steel body panels, aluminum panels, fiberglass, engine components, wheels, and frames, with specific media, grit, and pressure recommendations for each to strip paint safely without warping or substrate damage.<\/p>\n  <div class=\"l2-hero-meta\">\n    <span>&#128197; Updated April 2026<\/span>\n    <span>&#128338; 20 min read<\/span>\n    <span>&#9997; Henglihong Technical Editorial<\/span>\n  <\/div>\n<\/div>\n\n<nav class=\"l2-toc\" aria-label=\"Table of Contents\">\n  <div class=\"l2-toc-title\">&#9776; Table of Contents<\/div>\n  <ol>\n    <li><a href=\"#l2-why\">Why Automotive Blasting Is Different from Industrial Blasting<\/a><\/li>\n    <li><a href=\"#l2-substrates\">Substrate-by-Substrate Media Guide<\/a><\/li>\n    <li><a href=\"#l2-steel\">Steel Body Panels<\/a><\/li>\n    <li><a href=\"#l2-aluminum\">Aluminum Panels &amp; Components<\/a><\/li>\n    <li><a href=\"#l2-fiberglass\">Fiberglass &amp; GRP Bodies<\/a><\/li>\n    <li><a href=\"#l2-engine\">Engine Components &amp; Mechanical Parts<\/a><\/li>\n    <li><a href=\"#l2-frame\">Chassis, Frame &amp; Suspension<\/a><\/li>\n    <li><a href=\"#l2-wheels\">Wheels &amp; Rims<\/a><\/li>\n    <li><a href=\"#l2-process\">Step-by-Step Restoration Blasting Process<\/a><\/li>\n    <li><a href=\"#l2-mistakes\">Common Mistakes and How to Avoid Them<\/a><\/li>\n    <li><a href=\"#l2-faq\">H\u00e4ufig gestellte Fragen<\/a><\/li>\n  <\/ol>\n<\/nav>\n\n<section id=\"l2-why\">\n  <h2>Why Automotive Blasting Is Different from Industrial Blasting<\/h2>\n  <p>Automotive restoration blasting occupies a unique space between industrial surface preparation and precision component finishing. Unlike structural steel blasting, where the primary goals are aggressive rust removal, maximum anchor profile, and throughput, automotive restoration blasting must simultaneously achieve paint stripping while preserving substrate integrity \u2014 often on thin-gauge sheet metal (0.8\u20131.2 mm), complex curved surfaces, and a mixture of materials (steel, aluminum, fiberglass, and plastic) that may appear side by side on the same vehicle.<\/p>\n  <p>The central risk in automotive blasting is warping. Thin metal panels can be permanently deformed by the combination of abrasive impact and heat generated during blasting if the media is too heavy, the pressure too high, or the dwell time per spot too long. A warped panel that requires straightening adds hours of bodywork time \u2014 far more expensive than the time saved by blasting aggressively. The cardinal rule in automotive blasting is: <em>use the minimum force that achieves the desired result.<\/em><\/p>\n  <p>This page is part of Henglihong&#8217;s complete blasting media resource hub. For the full media type overview, see our <a href=\"https:\/\/hlh-js.com\/resource\/blog\/what-is-sandblasting-material-complete-guide-to-types-grit-selection\/\" target=\"_blank\" rel=\"noopener\">complete guide to sandblasting material types and selection<\/a>.<\/p>\n\n  <div class=\"l2-box l2-box-key\">\n    <div class=\"l2-box-title\">&#128270; The Golden Rule of Automotive Blasting<\/div>\n    <p><strong>Work from soft to hard.<\/strong> Start with the gentlest media that might work (walnut shell, soda, glass beads) and only step up to harder alternatives if the gentler option is insufficient. You can always increase aggressiveness; you cannot un-warp a panel, un-etch fiberglass, or un-strip a galvanized coating once it is damaged. When in doubt, test on a scrap piece of the same material and thickness before blasting the actual component.<\/p>\n  <\/div>\n<\/section>\n\n<section id=\"l2-substrates\">\n  <h2>Substrate-by-Substrate Media Guide: Quick Reference<\/h2>\n  <div class=\"l2-substrate-grid\">\n    <div class=\"l2-substrate-card l2-sc-steel\">\n      <h3>Steel Body Panels (Thin Gauge)<\/h3>\n      <span class=\"sc-media\">&#9655; Glass Beads or Crushed Glass Fine \/ Al\u2082O\u2083 F80\u2013F120 (low pressure)<\/span>\n      <p class=\"sc-why\">Remove paint and surface rust without warping 0.8\u20131.2 mm sheet. Keep pressure at 40\u201360 PSI. Work in overlapping passes; never dwell on one spot.<\/p>\n      <span class=\"sc-avoid\">Avoid: Steel grit, coarse angular media, high pressure<\/span>\n    <\/div>\n    <div class=\"l2-substrate-card l2-sc-aluminum\">\n      <h3>Aluminum Body Panels<\/h3>\n      <span class=\"sc-media\">&#9655; Glass Beads Size 35\u201360 (30\u201350 PSI max)<\/span>\n      <p class=\"sc-why\">Softer than steel \u2014 warps even more easily. Glass beads at low pressure strip paint without surface damage. Never use steel media or heavy angular abrasives.<\/p>\n      <span class=\"sc-avoid\">Avoid: Steel media (iron contamination), coarse angular abrasives<\/span>\n    <\/div>\n    <div class=\"l2-substrate-card l2-sc-fiber\">\n      <h3>Fiberglass \/ GRP Bodies<\/h3>\n      <span class=\"sc-media\">&#9655; Walnut Shell Medium or Plastic Grit<\/span>\n      <p class=\"sc-why\">Mineral abrasives will cut into glass fiber laminate. Only walnut shell or plastic grit removes paint without cutting below the gelcoat layer. Test on scrap first.<\/p>\n      <span class=\"sc-avoid\">Avoid: All mineral and metallic abrasives<\/span>\n    <\/div>\n    <div class=\"l2-substrate-card l2-sc-engine\">\n      <h3>Aluminum Engine Components<\/h3>\n      <span class=\"sc-media\">&#9655; Walnut Shell Fine or Glass Beads Fine<\/span>\n      <p class=\"sc-why\">Precision-machined surfaces and blind oil passages require gentle media. Walnut shell removes carbon and grime; glass beads clean and peen without dimensional change.<\/p>\n      <span class=\"sc-avoid\">Avoid: Angular mineral abrasives, steel media<\/span>\n    <\/div>\n  <\/div>\n<\/section>\n\n<section id=\"l2-steel\">\n  <h2>Steel Body Panels: Removing Paint Without Warping<\/h2>\n  <p>Steel body panels on classic car restorations are typically 18\u201320 gauge (0.8\u20131.2 mm thick). At this thickness, the panels have very limited resistance to thermally or mechanically induced deformation. Heavy media at high velocity generates impact forces and localized frictional heat that can exceed the panel&#8217;s yield strength \u2014 permanently warping or &#8220;oil-canning&#8221; the panel in a way that requires extensive metalwork to correct.<\/p>\n\n  <h3>Recommended Approach<\/h3>\n  <p>For steel body panels up to approximately 1.5 mm thickness:<\/p>\n  <ul>\n    <li><strong>Media:<\/strong> Fine-grade crushed glass (medium-fine) or <a href=\"https:\/\/hlh-js.com\/resource\/blog\/glass-beads-sandblasting-media-smooth-finish-peening-applications\/\" target=\"_blank\" rel=\"noopener\">glass beads (Size 35\u201360)<\/a>, or <a href=\"https:\/\/hlh-js.com\/resource\/blog\/aluminum-oxide-sandblasting-media-properties-grit-sizes-best-uses\/\" target=\"_blank\" rel=\"noopener\">aluminum oxide F80\u2013F120<\/a>.<\/li>\n    <li><strong>Pressure:<\/strong> 40\u201360 PSI. Never exceed 70 PSI on thin sheet metal panels regardless of media type.<\/li>\n    <li><strong>Nozzle distance:<\/strong> 8\u201312 inches from the surface. Closer distance concentrates impact energy and increases warping risk.<\/li>\n    <li><strong>Blast angle:<\/strong> 45\u00b0 to the surface (not perpendicular). Angled blasting reduces impact force per unit area, reducing warp risk.<\/li>\n    <li><strong>Movement:<\/strong> Keep the nozzle moving in overlapping sweeping passes. Never stop moving \u2014 a stationary nozzle over-concentrates energy on one spot within seconds.<\/li>\n    <li><strong>Temperatur:<\/strong> Do not blast in direct sunlight on hot days. Panels expand with heat and are more susceptible to warping when hot. Work in the morning or in a shaded area when possible.<\/li>\n  <\/ul>\n\n  <h3>Two-Stage Approach for Heavily Corroded Panels<\/h3>\n  <p>For panels with significant rust pitting or multiple layers of paint: first apply a coarse pass with medium crushed glass or Al\u2082O\u2083 F60\u2013F80 to break through the paint layers, then follow with a fine pass at lower pressure (Al\u2082O\u2083 F120 or glass beads) to clean the bare metal surface and create the appropriate primer adhesion profile. This two-stage approach removes material more effectively without subjecting the panel to sustained high-energy blasting.<\/p>\n\n  <div class=\"l2-box l2-box-warn\">\n    <div class=\"l2-box-title\">&#9888; Rust Pitting \u2014 Know When to Stop<\/div>\n    <p>Severe rust pitting removes metal thickness from the panel face. Aggressive blasting of heavily pitted panels does not restore them \u2014 it removes more metal, making the remaining panel thickness even thinner and more vulnerable to perforation. If rust pits are deeper than approximately one-third of the original panel thickness, consider whether the panel should be replaced rather than restored.<\/p>\n  <\/div>\n<\/section>\n\n<section id=\"l2-aluminum\">\n  <h2>Aluminum Panels &amp; Components<\/h2>\n  <p>Aluminum is significantly softer than steel (Mohs 2.5\u20133 vs. Mohs 4\u20135) and has a lower elastic modulus, making aluminum panels even more susceptible to warping from blasting than steel panels of equivalent thickness. Additionally, aluminum is sensitive to iron contamination \u2014 steel media embeds iron particles that cause galvanic corrosion in the aluminum matrix, particularly in humid or corrosive environments.<\/p>\n\n  <h3>Recommended Media: Glass Beads<\/h3>\n  <p><a href=\"https:\/\/hlh-js.com\/resource\/blog\/glass-beads-sandblasting-media-smooth-finish-peening-applications\/\" target=\"_blank\" rel=\"noopener\">Glass beads (Size 35\u201360)<\/a> at 30\u201350 PSI are the standard recommendation for paint stripping from aluminum body panels, bumpers, trim pieces, and structural aluminum components. The round particle geometry means each impact delivers a peening action rather than a cutting action \u2014 paint layers are progressively lifted and displaced without removing aluminum substrate material or creating sharp surface marks. The result is a clean, bright aluminum surface with a uniform matte-to-satin appearance that is ideal for subsequent primer application.<\/p>\n\n  <h3>Alternative: Soda Blast<\/h3>\n  <p>Sodium bicarbonate (soda blast) at 30\u201340 PSI is even gentler than glass beads and is used for the most delicate aluminum restoration work \u2014 vintage aircraft components, concours-quality show car aluminum, and aluminum with electroplated or anodized surfaces that must not be disturbed. Soda is water-soluble (easy cleanup with water rinse), non-toxic, leaves no embedded media particles, and cannot warp even the thinnest aluminum panels at low pressure. Its limitation is lower cleaning efficiency \u2014 it works slowly on thick or firmly adherent paint layers.<\/p>\n\n  <div class=\"l2-box l2-box-note\">\n    <div class=\"l2-box-title\">&#128203; Anodized Aluminum<\/div>\n    <p>Anodized aluminum has a hard oxide surface layer (Mohs 9) that is extremely difficult to blast through without removing the underlying aluminum substrate simultaneously. For anodized components that need to be refinished, chemical stripping is generally preferable to abrasive blasting \u2014 consult with an anodizing specialist before blasting any anodized part.<\/p>\n  <\/div>\n<\/section>\n\n<section id=\"l2-fiberglass\">\n  <h2>Fiberglass &amp; GRP Bodies: The Case for Organic Media<\/h2>\n  <p>Fiberglass-reinforced plastic (GRP or FRP) body panels \u2014 standard on kit cars, sports cars, and many classic American vehicles \u2014 present the most challenging blasting substrate in automotive restoration. The glass fiber laminate beneath the gelcoat layer has virtually no tolerance for mineral abrasive impact. Even glass beads at moderate pressure will cut through the thin gelcoat and begin fracturing individual glass fibers within the laminate, creating structural damage that is difficult and expensive to repair.<\/p>\n\n  <h3>Recommended Media: Walnut Shell<\/h3>\n  <p><a href=\"https:\/\/hlh-js.com\/resource\/blog\/walnut-shell-corn-cob-blasting-media-gentle-abrasives-for-delicate-surfaces\/\" target=\"_blank\" rel=\"noopener\">Walnut shell (medium grade)<\/a> at 30\u201350 PSI is the recommended media for fiberglass body panels. Its Mohs hardness of 3.5\u20134.0 is sufficient to break the adhesion of paint layers and lift them from the gelcoat surface, but too soft to cut through the gelcoat or fracture the underlying glass fiber structure. The result is a clean gelcoat surface ready for primer application, with the laminate integrity fully preserved.<\/p>\n\n  <h3>Critical Operating Notes for Fiberglass<\/h3>\n  <ul>\n    <li>Always test on a concealed area or scrap panel section first \u2014 gelcoat thickness and laminate quality vary between manufacturers and age of the vehicle.<\/li>\n    <li>Keep pressure at 30\u201350 PSI maximum. Even walnut shell at 70\u201380 PSI can damage thin or degraded fiberglass.<\/li>\n    <li>Work at a shallow blast angle (30\u201345\u00b0) to reduce the normal impact force component.<\/li>\n    <li>Inspect the gelcoat surface regularly during blasting. Stop immediately if you see the chalky white color of fiberglass laminate appearing \u2014 you have blasted through the gelcoat.<\/li>\n    <li>Never use mineral abrasives (aluminum oxide, garnet, crushed glass, steel media) on fiberglass regardless of grit size or pressure.<\/li>\n  <\/ul>\n<\/section>\n\n<section id=\"l2-engine\">\n  <h2>Engine Components &amp; Mechanical Parts<\/h2>\n  <p>Engine restoration blasting covers a wide range of components: cast iron blocks and heads, aluminum cylinder heads and intake manifolds, steel valve covers, connecting rods, crankshafts, and small precision components. Each has distinct requirements.<\/p>\n\n  <div class=\"l2-table-wrap\">\n    <table class=\"l2-table\">\n      <thead>\n        <tr><th>Komponente<\/th><th>Material<\/th><th>Media<\/th><th>Grit\/Size<\/th><th>Pressure<\/th><th>Ziel<\/th><\/tr>\n      <\/thead>\n      <tbody>\n        <tr><td>Cast iron block exterior<\/td><td>Cast iron<\/td><td>Aluminium-Oxid<\/td><td>F60\u2013F80<\/td><td>70\u201390 PSI<\/td><td>Remove paint, rust, scale<\/td><\/tr>\n        <tr><td>Aluminum cylinder head<\/td><td>Aluminium<\/td><td>Glasperlen<\/td><td>Size 35\u201360<\/td><td>40\u201360 PSI<\/td><td>Clean, no dimensional change<\/td><\/tr>\n        <tr><td>Intake\/exhaust manifolds<\/td><td>Cast iron \/ Aluminum<\/td><td>Aluminium-Oxid<\/td><td>F80\u2013F120<\/td><td>50\u201370 PSI<\/td><td>Remove carbon, oxidation<\/td><\/tr>\n        <tr><td>Crankshaft (journal cleaning)<\/td><td>Stahl<\/td><td>Glasperlen<\/td><td>Size 60<\/td><td>40\u201350 PSI<\/td><td>Clean without changing journal dimensions<\/td><\/tr>\n        <tr><td>Valve covers (aluminum)<\/td><td>Aluminium<\/td><td>Walnut Shell or Glass Beads<\/td><td>Medium \/ Size 35<\/td><td>30\u201350 PSI<\/td><td>Strip paint, no warp<\/td><\/tr>\n        <tr><td>Connecting rods (steel)<\/td><td>Stahl<\/td><td>Glasperlen<\/td><td>Size 35\u201360<\/td><td>50\u201370 PSI<\/td><td>Clean, peen, stress-relieve<\/td><\/tr>\n        <tr><td>Carburetors (zinc\/aluminum)<\/td><td>Zinc alloy \/ Al<\/td><td>Walnut Shell Fine or Corn Cob<\/td><td>Fine \/ Very Fine<\/td><td>20\u201340 PSI<\/td><td>Remove deposits without damage<\/td><\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n\n  <div class=\"l2-box l2-box-warn\">\n    <div class=\"l2-box-title\">&#9888; Blind Passages &amp; Oil Galleries<\/div>\n    <p>Never blast engine components without first plugging all oil galleries, coolant passages, and threaded holes with appropriate plugs or tape. Abrasive media entering engine internals causes catastrophic bearing and cylinder wall damage on first start-up. After blasting, thoroughly blow out all passages with clean, dry compressed air and verify all media has been removed before assembly.<\/p>\n  <\/div>\n<\/section>\n\n<section id=\"l2-frame\">\n  <h2>Chassis, Frame &amp; Suspension Components<\/h2>\n  <p>Vehicle frames, subframes, control arms, and suspension components are typically constructed from heavier-gauge carbon steel (2\u20136 mm wall thickness) that can tolerate more aggressive blasting than thin body panels without warping risk. The goal here is thorough rust removal and a well-profiled surface for chassis paint or rust-preventive coating \u2014 a genuine industrial surface preparation job rather than the gentle panel-finishing approach required above.<\/p>\n\n  <h3>Recommended Media and Approach<\/h3>\n  <ul>\n    <li><strong>Media:<\/strong> <a href=\"https:\/\/hlh-js.com\/resource\/blog\/aluminum-oxide-sandblasting-media-properties-grit-sizes-best-uses\/\" target=\"_blank\" rel=\"noopener\">Aluminum oxide F36\u2013F60<\/a> is the standard for frame and chassis work \u2014 hard, angular, and aggressive enough to remove heavy rust pits and multiple coating layers on robust steel sections. <a href=\"https:\/\/hlh-js.com\/resource\/blog\/garnet-sandblasting-media-low-dust-high-efficiency-for-metal-wood\/\" target=\"_blank\" rel=\"noopener\">Garnet G25\u2013G30<\/a> is a good outdoor alternative where low dust is preferred.<\/li>\n    <li><strong>Pressure:<\/strong> 70\u201390 PSI on heavy sections (3+ mm wall thickness). Reduce to 50\u201370 PSI for thinner suspension stampings.<\/li>\n    <li><strong>Target cleanliness:<\/strong> Aim for Sa 2.5 on frame sections to be painted with chassis epoxy or zinc-rich primer. Sa 2 is acceptable for structural sections that will be encapsulated in rubberized underbody coating.<\/li>\n    <li><strong>Rust pits:<\/strong> Deep corrosion pits in frame members may indicate structural compromise. Have the frame inspected by a qualified restorer or structural engineer before sandblasting reveals the full extent of corrosion.<\/li>\n  <\/ul>\n<\/section>\n\n<section id=\"l2-wheels\">\n  <h2>Wheels &amp; Rims<\/h2>\n  <p>Wheel restoration blasting is a specialized niche with distinct requirements depending on wheel material and intended finish.<\/p>\n\n  <h3>Cast Aluminum Alloy Wheels<\/h3>\n  <p>The most common restoration scenario. Paint, clearcoat, and brake dust accumulation on aluminum alloy wheels should be removed with <strong>glass beads (Size 35\u201360) at 50\u201370 PSI<\/strong>. This removes coatings efficiently while leaving the aluminum surface with a uniform matte finish ready for re-polishing, powder coating, or liquid paint. Avoid angular abrasives on cast aluminum wheels \u2014 surface scratching and profile marks from angular media are very difficult to polish out of the complex wheel face geometry.<\/p>\n\n  <h3>Steel Wheels (Pressed Steel)<\/h3>\n  <p>Pressed steel wheels (common on classic trucks, pre-1970s cars, and current entry-level vehicles) can be blasted with <strong>aluminum oxide F60\u2013F80 at 60\u201380 PSI<\/strong> without warping concerns. The goal is to remove rust and old paint and create a surface profile suitable for direct-to-metal primer application.<\/p>\n\n  <h3>Magnesium Wheels (Classic\/Racing)<\/h3>\n  <p>Magnesium alloy is extremely reactive \u2014 it will burn if sufficiently heated, and it corrodes aggressively. Blasting magnesium wheels requires non-sparking media (walnut shell or glass beads \u2014 never steel media, which creates sparks on impact) at very low pressure. This is a specialized process best carried out by restorers with specific experience in magnesium wheel restoration.<\/p>\n<\/section>\n\n<section id=\"l2-process\">\n  <h2>Step-by-Step Automotive Restoration Blasting Process<\/h2>\n  <div class=\"l2-process-steps\">\n    <div class=\"l2-process-step\">\n      <div class=\"l2-process-num\">1<\/div>\n      <div class=\"l2-process-body\">\n        <h3>Assess and document the vehicle condition<\/h3>\n        <p>Before any blasting, photograph the vehicle comprehensively and identify all substrate types (steel, aluminum, fiberglass, plastic trim). Note areas of existing rust perforation, prior bodywork, filler, and panel replacements. Plug all apertures that must not receive media \u2014 door drains, body cavity access holes, threaded inserts.<\/p>\n      <\/div>\n    <\/div>\n    <div class=\"l2-process-step\">\n      <div class=\"l2-process-num\">2<\/div>\n      <div class=\"l2-process-body\">\n        <h3>Degrease all surfaces<\/h3>\n        <p>Wash the vehicle with a strong degreaser to remove all wax, oils, and road grime before blasting. Blasting over contaminated surfaces embeds the contamination under the blast profile, causing adhesion failure when primer is applied. A clean start produces a reliable result.<\/p>\n      <\/div>\n    <\/div>\n    <div class=\"l2-process-step\">\n      <div class=\"l2-process-num\">3<\/div>\n      <div class=\"l2-process-body\">\n        <h3>Select and set up media for each substrate type<\/h3>\n        <p>You will likely need different media and pressure settings for different areas of the vehicle. Set up separate media loads for the body panels (gentle media) and the chassis\/frame (harder media). Label hoses and ensure they are not cross-contaminated between setups.<\/p>\n      <\/div>\n    <\/div>\n    <div class=\"l2-process-step\">\n      <div class=\"l2-process-num\">4<\/div>\n      <div class=\"l2-process-body\">\n        <h3>Blast from interior surfaces outward<\/h3>\n        <p>Start with interior surfaces (floor pan, trunk, firewall) before exterior panels. This sequence reveals hidden rust in enclosed areas and prevents re-contamination of blasted exterior panels with media kicked up from unblasted interior surfaces.<\/p>\n      <\/div>\n    <\/div>\n    <div class=\"l2-process-step\">\n      <div class=\"l2-process-num\">5<\/div>\n      <div class=\"l2-process-body\">\n        <h3>Inspect and address rust immediately after blasting<\/h3>\n        <p>Carbon steel begins to flash rust within 30\u201390 minutes of blasting in humid air. After each blasting session, inspect the freshly blasted metal immediately and apply a rust-inhibiting primer or conversion coating within 2\u20134 hours. Do not leave bare blasted metal overnight without protection.<\/p>\n      <\/div>\n    <\/div>\n    <div class=\"l2-process-step\">\n      <div class=\"l2-process-num\">6<\/div>\n      <div class=\"l2-process-body\">\n        <h3>Apply primer within the specified overcoat window<\/h3>\n        <p>Two-part epoxy primer applied directly over the blasted metal provides the best corrosion protection and adhesion for subsequent bodywork layers. Follow the primer manufacturer&#8217;s TDS for surface condition requirements, mixing ratio, application thickness, and overcoat timing.<\/p>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<section id=\"l2-mistakes\">\n  <h2>Common Mistakes in Automotive Blasting<\/h2>\n\n  <div class=\"l2-box l2-box-warn\">\n    <div class=\"l2-box-title\">&#9888; Using steel grit or heavy abrasives on thin body panels<\/div>\n    <p>Steel grit&#8217;s high density and angular geometry make it extremely effective on structural steel \u2014 and extremely damaging on thin body panels. The kinetic energy delivered by steel grit at standard industrial pressures will warp, stretch, and oil-can thin sheet metal irreversibly. Never use steel grit or steel shot for automotive body panel blasting, regardless of how quickly you want to remove the paint.<\/p>\n  <\/div>\n  <div class=\"l2-box l2-box-warn\">\n    <div class=\"l2-box-title\">&#9888; Blasting fiberglass with mineral abrasives<\/div>\n    <p>The most common and most expensive mistake in fiberglass restoration. Garnet, crushed glass, and aluminum oxide are all harder than the gelcoat and glass fiber composite structure. Even at low pressures, they will cut through the gelcoat within seconds and begin fracturing the glass fibers beneath. The resulting damage requires extensive laminate repair. If you are unsure what substrate you are blasting, use walnut shell at minimum pressure as the default safe choice.<\/p>\n  <\/div>\n  <div class=\"l2-box l2-box-warn\">\n    <div class=\"l2-box-title\">&#9888; Leaving bare metal unprimed overnight<\/div>\n    <p>Freshly blasted carbon steel is more reactive than unprepared steel \u2014 the abrasive impact has broken the surface oxide layer and exposed virgin metal with high surface energy. In humid conditions, flash rust appears within 30\u201390 minutes. A car that is beautifully blasted on a Friday afternoon and left unprimed over a wet weekend can have visible surface rust by Monday morning, requiring re-blasting before primer can be applied.<\/p>\n  <\/div>\n  <div class=\"l2-box l2-box-warn\">\n    <div class=\"l2-box-title\">&#9888; Not plugging media entry points<\/div>\n    <p>Abrasive media entering door cavities, body seams, sill sections, and mechanical assemblies is extremely difficult to remove and causes accelerated corrosion in enclosed spaces (trapped moisture + abrasive particles + metal = galvanic and abrasive corrosion). Before blasting, systematically plug all drain holes, access holes, and seam gaps with foam backer rod, rubber plugs, or tape appropriate for the blast pressure being used.<\/p>\n  <\/div>\n<\/section>\n\n<section id=\"l2-faq\">\n  <h2>H\u00e4ufig gestellte Fragen<\/h2>\n  <div>\n    <div class=\"l2-faq-item\">\n      <button class=\"l2-faq-q\" onclick=\"this.closest('.l2-faq-item').classList.toggle('open')\">\n        What is the best media for removing paint from a classic car body?\n        <span class=\"l2-faq-icon\">+<\/span>\n      <\/button>\n      <div class=\"l2-faq-a\">\n        <p>The answer depends on the body material. For steel body panels: fine crushed glass, glass beads (Size 35\u201360), or aluminum oxide F80\u2013F120 at 40\u201360 PSI. For aluminum panels: glass beads Size 35\u201360 at 30\u201350 PSI exclusively \u2014 never steel media. For fiberglass: walnut shell (medium grade) at 30\u201350 PSI \u2014 the only mineral-free option that won&#8217;t damage the laminate. The consistent theme across all automotive substrates: use the gentlest media that removes the paint, at the lowest pressure that achieves the result, and keep the nozzle moving at all times.<\/p>\n      <\/div>\n    <\/div>\n    <div class=\"l2-faq-item\">\n      <button class=\"l2-faq-q\" onclick=\"this.closest('.l2-faq-item').classList.toggle('open')\">\n        Will sandblasting warp my door panels?\n        <span class=\"l2-faq-icon\">+<\/span>\n      <\/button>\n      <div class=\"l2-faq-a\">\n        <p>Warping is a real risk with thin door panels (typically 0.9\u20131.1 mm gauge) if the wrong media or excessive pressure is used. Heavy media (steel shot\/grit, coarse aluminum oxide), high pressure (above 70 PSI), or stationary nozzle technique can all cause permanent warping. With the correct media (glass beads or fine crushed glass), appropriate pressure (40\u201360 PSI), and proper moving nozzle technique, door panels can be blasted clean without warping. Some highly skilled restorers prefer soda blasting for the most critical visible panels precisely because soda is so gentle that warping is virtually impossible at any reasonable pressure.<\/p>\n      <\/div>\n    <\/div>\n    <div class=\"l2-faq-item\">\n      <button class=\"l2-faq-q\" onclick=\"this.closest('.l2-faq-item').classList.toggle('open')\">\n        How long after blasting can I leave bare metal before priming?\n        <span class=\"l2-faq-icon\">+<\/span>\n      <\/button>\n      <div class=\"l2-faq-a\">\n        <p>On carbon steel, the window between blasting completion and primer application is 2\u20134 hours in dry conditions (below 60% relative humidity) and potentially as short as 30 minutes in humid or coastal environments. Visible flash rust (orange-brown discoloration) means re-blasting is required before primer can be applied. Plan your blasting sessions to ensure primer application follows within the same work session. If you must wait longer, apply a thin coat of epoxy primer within the first hour and then recoat within the primer&#8217;s overcoat window. For aluminum and fiberglass, flash rust is not a concern \u2014 these materials can be left unprimed overnight after blasting without contamination risk.<\/p>\n      <\/div>\n    <\/div>\n    <div class=\"l2-faq-item\">\n      <button class=\"l2-faq-q\" onclick=\"this.closest('.l2-faq-item').classList.toggle('open')\">\n        Can I blast my engine block in the car?\n        <span class=\"l2-faq-icon\">+<\/span>\n      <\/button>\n      <div class=\"l2-faq-a\">\n        <p>In-car engine blasting is strongly discouraged. Abrasive media inevitably migrates into areas that are extremely difficult to clean \u2014 valve covers, oil pan, timing chain cavity, intake manifold \u2014 and even a small amount of abrasive media in the oil or intake system will cause rapid engine failure on first start-up. For any serious engine restoration, the engine should be removed from the vehicle, fully disassembled, all passages blocked, and individual components cleaned separately. This approach allows thorough post-blast cleaning of every part and eliminates the risk of media contamination causing catastrophic engine damage.<\/p>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<hr class=\"l2-divider\">\n\n<div class=\"l2-related\">\n  <div class=\"l2-related-title\">&#128214; Related Guides in This Resource Hub<\/div>\n  <ul>\n    <li><a href=\"https:\/\/hlh-js.com\/resource\/blog\/what-is-sandblasting-material-complete-guide-to-types-grit-selection\/\" target=\"_blank\" rel=\"noopener\"><span>&#9656;<\/span>Complete Guide to Sandblasting Material (Pillar)<\/a><\/li>\n    <li><a href=\"https:\/\/hlh-js.com\/resource\/blog\/glass-beads-sandblasting-media-smooth-finish-peening-applications\/\" target=\"_blank\" rel=\"noopener\"><span>&#9656;<\/span>Glass Beads: Aluminum &amp; Thin Metal Guide<\/a><\/li>\n    <li><a href=\"https:\/\/hlh-js.com\/resource\/blog\/walnut-shell-corn-cob-blasting-media-gentle-abrasives-for-delicate-surfaces\/\" target=\"_blank\" rel=\"noopener\"><span>&#9656;<\/span>Walnut Shell: Fiberglass &amp; Delicate Surfaces<\/a><\/li>\n    <li><a href=\"https:\/\/hlh-js.com\/resource\/blog\/aluminum-oxide-sandblasting-media-properties-grit-sizes-best-uses\/\" target=\"_blank\" rel=\"noopener\"><span>&#9656;<\/span>Aluminum Oxide: Steel &amp; Frame Blasting<\/a><\/li>\n    <li><a href=\"https:\/\/hlh-js.com\/resource\/blog\/crushed-glass-sandblasting-media-eco-friendly-alternative-to-silica-sand\/\" target=\"_blank\" rel=\"noopener\"><span>&#9656;<\/span>Crushed Glass: Eco Panel Stripping<\/a><\/li>\n    <li><a href=\"https:\/\/hlh-js.com\/resource\/blog\/sandblasting-media-comparison-chart-hardness-cost-recyclability\/\" target=\"_blank\" rel=\"noopener\"><span>&#9656;<\/span>Full Media Comparison Chart<\/a><\/li>\n    <li><a href=\"https:\/\/hlh-js.com\/resource\/blog\/how-to-choose-sandblasting-material-step-by-step-selection-guide\/\" target=\"_blank\" rel=\"noopener\"><span>&#9656;<\/span>Step-by-Step Media Selection Guide<\/a><\/li>\n    <li><a href=\"https:\/\/hlh-js.com\/resource\/blog\/best-sandblasting-material-for-metal-surface-prep-before-painting-coating\/\" target=\"_blank\" rel=\"noopener\"><span>&#9656;<\/span>Best Media for Industrial Metal Surface Prep<\/a><\/li>\n  <\/ul>\n<\/div>\n\n<div class=\"l2-cta-pair\">\n  <div class=\"l2-cta l2-cta-primary\">\n    <h3>Request a Quote<\/h3>\n    <p>Need glass beads, walnut shell, or aluminum oxide for your restoration project? Tell us your grit size, quantity, and packaging format \u2014 we&#8217;ll respond with competitive pricing within 24 hours.<\/p>\n    <a class=\"l2-btn l2-btn-white\" href=\"https:\/\/hlh-js.com\/contact\/\" target=\"_blank\" rel=\"noopener\">Get a Free Quote &#8594;<\/a>\n  <\/div>\n  <div class=\"l2-cta l2-cta-secondary\">\n    <h3>Talk to a Technical Advisor<\/h3>\n    <p>Not sure which media is right for your restoration substrate? Our team can advise on the correct media, grit size, and operating parameters for every automotive blasting application.<\/p>\n    <a class=\"l2-btn l2-btn-dark\" href=\"https:\/\/hlh-js.com\/contact\/\" target=\"_blank\" rel=\"noopener\">Contact Our Team &#8594;<\/a>\n  <\/div>\n<\/div>\n<\/div>\n<script>\n(function(){\n  document.querySelectorAll('.l2-faq-q').forEach(function(btn){\n    btn.addEventListener('click',function(){\n      var item=this.closest('.l2-faq-item');\n      var icon=item.querySelector('.l2-faq-icon');\n      var wasOpen=item.classList.contains('open');\n      document.querySelectorAll('.l2-faq-item').forEach(function(el){\n        el.classList.remove('open');\n        el.querySelector('.l2-faq-icon').textContent='+';\n      });\n      if(!wasOpen){item.classList.add('open');icon.textContent='\u00d7';}\n    });\n  });\n})();\n<\/script>","protected":false},"excerpt":{"rendered":"<p>Jiangsu Henglihong Technology Co., Ltd. Sandblasting Material for Automotive Restoration:  [&#8230;]<\/p>","protected":false},"author":1,"featured_media":12910,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62,175,138],"tags":[],"class_list":["post-12894","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-industry","category-resource"],"_links":{"self":[{"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/posts\/12894","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/comments?post=12894"}],"version-history":[{"count":2,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/posts\/12894\/revisions"}],"predecessor-version":[{"id":12896,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/posts\/12894\/revisions\/12896"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/media\/12910"}],"wp:attachment":[{"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/media?parent=12894"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/categories?post=12894"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hlh-js.com\/de\/wp-json\/wp\/v2\/tags?post=12894"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}