{"id":82774,"date":"2026-10-18T00:46:29","date_gmt":"2026-10-17T22:46:29","guid":{"rendered":"https:\/\/panelsandwich.org\/how-to-paint-a-sandwich-panel-paint-primer-and-steps\/"},"modified":"2026-10-18T01:10:02","modified_gmt":"2026-10-17T23:10:02","slug":"how-to-paint-a-sandwich-panel-paint-primer-and-steps","status":"publish","type":"post","link":"https:\/\/panelsandwich.org\/en\/how-to-paint-a-sandwich-panel-paint-primer-and-steps\/","title":{"rendered":"How to Paint a Sandwich Panel: Paint, Primer and Steps"},"content":{"rendered":"<div class=\"product\"><div class=\"product\"><div style=\"background-color: #f4f5f7; font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; line-height: 1.6; color: #333333; padding: 20px;\">\n<div style=\"max-width: 800px; margin: 0 auto; background-color: #ffffff; border-radius: 8px; padding: 40px; box-shadow: 0 10px 40px -10px rgba(16, 24, 40, 0.15); border-top: 5px solid #fba905;\">\n<p style=\"margin-bottom: 18px; color: #444;\">Yes, <strong style=\"color: #101828;\">you can paint a sandwich panel<\/strong>, but not like a wall. The panel&#8217;s outer face is galvanized steel sheet with a factory coating, and if the new paint isn&#8217;t applied properly, it will peel off after the first summer. Here&#8217;s when it&#8217;s worth doing, which paint to use, and the steps to make it last.  <\/p>\n<h2 style=\"color: #101828; font-size: 1.6rem; margin-top: 40px; margin-bottom: 20px; border-bottom: 2px solid #eee; padding-bottom: 10px; font-weight: 700;\">Does sandwich panel need to be painted?<\/h2>\n<p style=\"margin-bottom: 18px; color: #444;\">It&#8217;s not mandatory. The panel comes factory-coated in the RAL color you choose, and that coating protects the sheet for many years (we explain this in <a href=\"https:\/\/panelsandwich.org\/en\/sandwich-panel-durability\/\" style=\"color: #101828; text-decoration: none; border-bottom: 2px solid #fba905; font-weight: 600;\">how long a sandwich panel lasts<\/a>). There are three cases where painting makes sense:  <\/p>\n<ul style=\"margin: 0 0 20px 0; padding-left: 22px;\">\n<li style=\"margin-bottom: 10px; color: #444;\"><strong style=\"color: #101828;\">Touch-ups:<\/strong> scratches, dents or cuts where the steel is exposed. These should be touched up quickly to prevent rust. <\/li>\n<li style=\"margin-bottom: 10px; color: #444;\"><strong style=\"color: #101828;\">Color change:<\/strong> you want a different color on an existing fa\u00e7ade or roof.<\/li>\n<li style=\"margin-bottom: 10px; color: #444;\"><strong style=\"color: #101828;\">Renovation:<\/strong> the coating has lost its shine or has a white powdery film (chalking) after years in the sun.<\/li>\n<\/ul>\n<p style=\"margin-bottom: 18px; color: #444;\">If the panel is punctured, has a wet core, or the sheet is badly rusted, painting won&#8217;t fix it: those panels need to be replaced. And if you&#8217;re buying new panels, it&#8217;s far more cost-effective to order them already in the color you want: check the <a href=\"https:\/\/panelsandwich.org\/en\/sandwich-panel-colours-ral-chart-and-finishes\/\" style=\"color: #101828; text-decoration: none; border-bottom: 2px solid #fba905; font-weight: 600;\">RAL color chart<\/a>. <\/p>\n<h2 style=\"color: #101828; font-size: 1.6rem; margin-top: 40px; margin-bottom: 20px; border-bottom: 2px solid #eee; padding-bottom: 10px; font-weight: 700;\">Which Paint to Use<\/h2>\n<div style=\"overflow-x: auto;\">\n<table style=\"width: 100%; border-collapse: collapse; margin: 30px 0; border-radius: 6px; overflow: hidden; box-shadow: 0 2px 10px rgba(0,0,0,0.05); background-color: #fff;\">\n<thead>\n<tr style=\"background-color: #101828; color: #ffffff;\">\n<th style=\"padding: 15px; text-align: left; text-transform: uppercase; font-size: 0.85rem; letter-spacing: 0.5px;\">Layer<\/th>\n<th style=\"padding: 15px; text-align: left; text-transform: uppercase; font-size: 0.85rem; letter-spacing: 0.5px;\">What to use<\/th>\n<th style=\"padding: 15px; text-align: left; text-transform: uppercase; font-size: 0.85rem; letter-spacing: 0.5px;\">Purpose<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom: 1px solid #eee;\">\n<td style=\"padding: 15px; color: #101828; font-weight: bold;\">Primer<\/td>\n<td style=\"padding: 15px; color: #333;\">Adhesion primer for galvanized and coated sheet metal (water-based acrylic or two-component epoxy)<\/td>\n<td style=\"padding: 15px; color: #333;\">So the paint bonds to the smooth sheet<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #eee;\">\n<td style=\"padding: 15px; color: #101828; font-weight: bold;\">Rust inhibitor (only in rusted areas)<\/td>\n<td style=\"padding: 15px; color: #333;\">Anti-corrosive primer applied over brushed rust<\/td>\n<td style=\"padding: 15px; color: #333;\">To stop corrosion at cuts and dents<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #eee;\">\n<td style=\"padding: 15px; color: #101828; font-weight: bold;\">Finish<\/td>\n<td style=\"padding: 15px; color: #333;\">Water-based acrylic or polyurethane enamel for metal; for roofs, acrylic paint for metal roofing (reflective is best)<\/td>\n<td style=\"padding: 15px; color: #333;\">Color, UV protection and weather resistance<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"margin-bottom: 18px; color: #444;\"><strong style=\"color: #101828;\">Avoid<\/strong> synthetic (alkyd) enamels directly on galvanized surfaces: over time they lose adhesion and flake off. Always read the paint&#8217;s technical data sheet and check that it&#8217;s suitable for pre-coated galvanized sheet metal. <\/p>\n<h2 style=\"color: #101828; font-size: 1.6rem; margin-top: 40px; margin-bottom: 20px; border-bottom: 2px solid #eee; padding-bottom: 10px; font-weight: 700;\">How to Paint a Sandwich Panel Step by Step<\/h2>\n<ol style=\"margin: 0 0 20px 0; padding-left: 22px;\">\n<li style=\"margin-bottom: 10px; color: #444;\"><strong style=\"color: #101828;\">Choose the right day:<\/strong> no rain forecast, no dew, and mild temperatures (roughly between 10 and 30\u00b0C). In summer, don&#8217;t paint the roof in direct sunlight: the sheet gets very hot and the paint won&#8217;t dry properly. <\/li>\n<li style=\"margin-bottom: 10px; color: #444;\"><strong style=\"color: #101828;\">Clean:<\/strong> use water with neutral soap and a soft brush, or a low-pressure power washer, avoiding joints and trims. Remove moss, dust and chalking. <\/li>\n<li style=\"margin-bottom: 10px; color: #444;\"><strong style=\"color: #101828;\">Degrease:<\/strong> apply a degreaser compatible with the paint and rinse. Let it dry completely. <\/li>\n<li style=\"margin-bottom: 10px; color: #444;\"><strong style=\"color: #101828;\">Sand:<\/strong> lightly sand (fine sandpaper or an abrasive pad) to remove the shine from the coating. Don&#8217;t sand down to the steel. <\/li>\n<li style=\"margin-bottom: 10px; color: #444;\"><strong style=\"color: #101828;\">Treat the rust:<\/strong> at cuts, edges and dents, brush off any loose rust and apply anti-corrosive primer.<\/li>\n<li style=\"margin-bottom: 10px; color: #444;\"><strong style=\"color: #101828;\">Prime:<\/strong> apply a coat of adhesion primer over the entire surface, allowing the manufacturer&#8217;s recommended drying time.<\/li>\n<li style=\"margin-bottom: 10px; color: #444;\"><strong style=\"color: #101828;\">Paint:<\/strong> apply two thin coats of finish with a roller, using a brush for overlaps and trims, or an airless sprayer for large surfaces. Paint in the direction of the ribs. <\/li>\n<li style=\"margin-bottom: 10px; color: #444;\"><strong style=\"color: #101828;\">Check joints and screws:<\/strong> take the opportunity to replace any damaged washers and seal with polyurethane sealant or neutral-cure silicone, never acidic silicone.<\/li>\n<\/ol>\n<h2 style=\"color: #101828; font-size: 1.6rem; margin-top: 40px; margin-bottom: 20px; border-bottom: 2px solid #eee; padding-bottom: 10px; font-weight: 700;\">Painting the Roof: Safety<\/h2>\n<p style=\"margin-bottom: 18px; color: #444;\">On a <a href=\"https:\/\/panelsandwich.org\/en\/sandwich-panel-for-roofing\/\" style=\"color: #101828; text-decoration: none; border-bottom: 2px solid #fba905; font-weight: 600;\">sandwich panel roof<\/a>, <strong style=\"color: #101828;\">only step on the purlins<\/strong> (the line of screws), never in the middle of the span or on the <a href=\"https:\/\/panelsandwich.org\/en\/natural-light-in-sandwich-panel-roofs\/\" style=\"color: #101828; text-decoration: none; border-bottom: 2px solid #fba905; font-weight: 600;\">skylights<\/a>. Work with a harness attached to a lifeline, and don&#8217;t go up if it&#8217;s windy or the sheet is wet. If the roof is high or large, hire a company with the proper safety equipment.  <\/p>\n<h2 style=\"color: #101828; font-size: 1.6rem; margin-top: 40px; margin-bottom: 20px; border-bottom: 2px solid #eee; padding-bottom: 10px; font-weight: 700;\">Can the Inner Face Be Painted?<\/h2>\n<p style=\"margin-bottom: 18px; color: #444;\">Yes, and it&#8217;s easier: it&#8217;s not exposed to sun or rain. Clean it, sand lightly, prime it and apply water-based acrylic paint. In <a href=\"https:\/\/panelsandwich.org\/en\/cold-room-sandwich-panel\/\" style=\"color: #101828; text-decoration: none; border-bottom: 2px solid #fba905; font-weight: 600;\">cold storage rooms<\/a> or food industry settings, use paints suitable for that purpose or, better still, leave the factory coating as is, since it&#8217;s easy to clean.  <\/p>\n<h2 style=\"color: #101828; font-size: 1.6rem; margin-top: 40px; margin-bottom: 20px; border-bottom: 2px solid #eee; padding-bottom: 10px; font-weight: 700;\">Paint or Replace the Panel<\/h2>\n<div style=\"overflow-x: auto;\">\n<table style=\"width: 100%; border-collapse: collapse; margin: 30px 0; border-radius: 6px; overflow: hidden; box-shadow: 0 2px 10px rgba(0,0,0,0.05); background-color: #fff;\">\n<thead>\n<tr style=\"background-color: #101828; color: #ffffff;\">\n<th style=\"padding: 15px; text-align: left; text-transform: uppercase; font-size: 0.85rem; letter-spacing: 0.5px;\">Situation<\/th>\n<th style=\"padding: 15px; text-align: left; text-transform: uppercase; font-size: 0.85rem; letter-spacing: 0.5px;\">What to do<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom: 1px solid #eee;\">\n<td style=\"padding: 15px; color: #101828; font-weight: bold;\">Isolated scratches and dents<\/td>\n<td style=\"padding: 15px; color: #333;\">Touch up with paint in the same RAL color<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #eee;\">\n<td style=\"padding: 15px; color: #101828; font-weight: bold;\">Dull or chalking coating, sheet in good condition<\/td>\n<td style=\"padding: 15px; color: #333;\">Repaint following the steps<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #eee;\">\n<td style=\"padding: 15px; color: #101828; font-weight: bold;\">Rust on overlaps and screws, sheet in good condition<\/td>\n<td style=\"padding: 15px; color: #333;\">Treat the rust, replace the screws and repaint<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #eee;\">\n<td style=\"padding: 15px; color: #101828; font-weight: bold;\">Punctured sheet, leaks, wet core<\/td>\n<td style=\"padding: 15px; color: #333;\">Replace the affected panels<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #eee;\">\n<td style=\"padding: 15px; color: #101828; font-weight: bold;\">Asbestos-cement roof (uralita)<\/td>\n<td style=\"padding: 15px; color: #333;\">Do not paint: <a href=\"https:\/\/panelsandwich.org\/en\/what-is-the-problem-with-fiber-cement\/\" style=\"color: #101828; text-decoration: none; border-bottom: 2px solid #fba905; font-weight: 600;\">replace it with sandwich panel<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"margin-bottom: 18px; color: #444;\">For the rest of the maintenance (cleaning, inspections and what not to do), check out our <a href=\"https:\/\/panelsandwich.org\/en\/everything-you-need-to-know-about-sandwich-panel-roofing-maintenance\/\" style=\"color: #101828; text-decoration: none; border-bottom: 2px solid #fba905; font-weight: 600;\">sandwich panel roof maintenance guide<\/a>. If you need new panels, take a look at the <a href=\"https:\/\/panelsandwich.org\/en\/how-much-does-a-meter-of-sandwich-panel-cost-today\/\" style=\"color: #101828; text-decoration: none; border-bottom: 2px solid #fba905; font-weight: 600;\">sandwich panel price per m\u00b2<\/a>. <\/p>\n<h2 style=\"color: #101828; font-size: 1.6rem; margin-top: 40px; margin-bottom: 20px; border-bottom: 2px solid #eee; padding-bottom: 10px; font-weight: 700;\">Frequently asked questions<\/h2>\n<div style=\"background-color: #f8f9fa; border-left: 4px solid #fba905; padding: 20px; margin-bottom: 15px; border-radius: 0 6px 6px 0;\">\n<h3 style=\"display: block; font-weight: bold; color: #101828; margin: 0 0 8px 0; font-size: 1rem; line-height: 1.6;\">What Paint Is Used for Sandwich Panels?<\/h3>\n<p style=\"margin: 0; color: #555;\">An adhesion primer for coated galvanized sheet metal and a water-based acrylic or polyurethane finish for metal. For roofs, acrylic paint for metal roofing. <\/p>\n<\/div>\n<div style=\"background-color: #f8f9fa; border-left: 4px solid #fba905; padding: 20px; margin-bottom: 15px; border-radius: 0 6px 6px 0;\">\n<h3 style=\"display: block; font-weight: bold; color: #101828; margin: 0 0 8px 0; font-size: 1rem; line-height: 1.6;\">Can a Sandwich Panel Be Painted Without Primer?<\/h3>\n<p style=\"margin: 0; color: #555;\">For a small touch-up with touch-up paint in the same RAL color, yes. For repainting entire panels, no: without primer, the paint won&#8217;t bond properly to the coated sheet metal and will end up peeling. <\/p>\n<\/div>\n<div style=\"background-color: #f8f9fa; border-left: 4px solid #fba905; padding: 20px; margin-bottom: 15px; border-radius: 0 6px 6px 0;\">\n<h3 style=\"display: block; font-weight: bold; color: #101828; margin: 0 0 8px 0; font-size: 1rem; line-height: 1.6;\">Can the Color of a Sandwich Panel Be Changed?<\/h3>\n<p style=\"margin: 0; color: #555;\">Yes, by applying primer and two coats of finish. If going from a dark to a light color, an extra coat may be needed. <\/p>\n<\/div>\n<div style=\"background-color: #f8f9fa; border-left: 4px solid #fba905; padding: 20px; margin-bottom: 15px; border-radius: 0 6px 6px 0;\">\n<h3 style=\"display: block; font-weight: bold; color: #101828; margin: 0 0 8px 0; font-size: 1rem; line-height: 1.6;\">How Often Does a Sandwich Panel Need to Be Painted?<\/h3>\n<p style=\"margin: 0; color: #555;\">With a factory coating in good condition, there&#8217;s no need to paint it for many years. Just inspect the sheet once a year and touch up any dents. <\/p>\n<\/div>\n<div style=\"background-color: #f8f9fa; border-left: 4px solid #101828; padding: 20px; margin: 30px 0; border-radius: 0 6px 6px 0;\"><span style=\"display: block; font-weight: bold; color: #101828; margin-bottom: 5px; text-transform: uppercase; font-size: 0.85rem; letter-spacing: 0.5px;\">Is It More Cost-Effective to Replace the Panels?<\/span><\/p>\n<p style=\"margin: 0; color: #555;\">We&#8217;ll prepare a quote for new panels in the color you want, including trims and screws. <a href=\"https:\/\/panelsandwich.org\/en\/contact\/\" style=\"color: #101828; text-decoration: none; border-bottom: 2px solid #fba905; font-weight: 600;\">Request a quote<\/a> or call us at 683 442 608.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Yes, you can paint a sandwich panel, but not like a wall. The panel&#8217;s outer face is galvanized steel sheet with a factory coating, and if the new paint isn&#8217;t applied properly, it will peel off after the first summer. Here&#8217;s when it&#8217;s worth doing, which paint to use, and the steps to make it [&hellip;]<\/p>\n","protected":false},"author":6055,"featured_media":55364,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2977],"tags":[],"class_list":["post-82774","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sandwich-panels-en"],"_links":{"self":[{"href":"https:\/\/panelsandwich.org\/en\/wp-json\/wp\/v2\/posts\/82774","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/panelsandwich.org\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/panelsandwich.org\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/panelsandwich.org\/en\/wp-json\/wp\/v2\/users\/6055"}],"replies":[{"embeddable":true,"href":"https:\/\/panelsandwich.org\/en\/wp-json\/wp\/v2\/comments?post=82774"}],"version-history":[{"count":2,"href":"https:\/\/panelsandwich.org\/en\/wp-json\/wp\/v2\/posts\/82774\/revisions"}],"predecessor-version":[{"id":82872,"href":"https:\/\/panelsandwich.org\/en\/wp-json\/wp\/v2\/posts\/82774\/revisions\/82872"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/panelsandwich.org\/en\/wp-json\/wp\/v2\/media\/55364"}],"wp:attachment":[{"href":"https:\/\/panelsandwich.org\/en\/wp-json\/wp\/v2\/media?parent=82774"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/panelsandwich.org\/en\/wp-json\/wp\/v2\/categories?post=82774"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/panelsandwich.org\/en\/wp-json\/wp\/v2\/tags?post=82774"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}