{"product_id":"sem-self-etching-primer-grey-15-5-oz-high-adhesion-metal-primer-for-spot-repairs","title":"SEM Self-Etching Primer Grey 15.5 oz — High-Adhesion Metal Primer for Spot Repairs","description":"\u003cp\u003e\u003cb\u003eSEM 39683 Grey Self Etching Primer is a 15.5 oz aerosol primer formulated to create a durable, high-adhesion base coat on bare metal and difficult-to-bond substrates.\u003c\/b\u003e\u003c\/p\u003e\n\n\u003cp\u003eDesigned as the first coating step, this self-etching primer etches and primes in a single application to improve topcoat adhesion and corrosion resistance on automotive and industrial metal surfaces. Packaged in a convenient 15.5 oz aerosol can, SEM 39683 simplifies prep work by reducing the need for separate etching or adhesion promoters. Made in the United States, it’s sized for easy handling and targeted repairs.\u003c\/p\u003e\n\n\u003ch3\u003eWhat does this primer do for bare metal surfaces?\u003c\/h3\u003e\n\u003cp\u003eSEM 39683 chemically prepares bare metal by creating a micro-etched surface that promotes mechanical and chemical bonding for subsequent paint layers. It is intended to be applied as the first coat after cleaning, improving adhesion and helping reduce lift or peeling of topcoats.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eForms an etched surface to improve paint bond\u003c\/li\u003e\n  \u003cli\u003eUseful on steel, aluminum and other untreated metals\u003c\/li\u003e\n  \u003cli\u003eReduces the need for separate acid-etch steps\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I apply the 15.5 oz aerosol for best results?\u003c\/h3\u003e\n\u003cp\u003eShake the can thoroughly, clean the substrate of rust, grease and contaminants, and hold the spray 8–12 inches from the surface while applying light, even coats. Allow proper flash time between coats and before applying the topcoat to ensure a continuous, non-tacky film.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSurface prep: remove oils, loose rust, dirt\u003c\/li\u003e\n  \u003cli\u003eSpray distance: 8–12 inches for even coverage\u003c\/li\u003e\n  \u003cli\u003eApply multiple thin coats rather than one heavy coat\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill it accept all types of topcoats and clearcoats?\u003c\/h3\u003e\n\u003cp\u003eThis primer is formulated to be compatible with a wide range of conventional automotive and industrial topcoats when fully dry. Verify compatibility with specialty coatings (e.g., some powder coats or certain two-component systems) by testing in a small area before full application.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWorks well under most solvent-borne and acrylic coatings\u003c\/li\u003e\n  \u003cli\u003eAllow full dry\/cure before applying finish coats\u003c\/li\u003e\n  \u003cli\u003ePerform a small adhesion test for unfamiliar systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich practical details should I consider before purchase?\u003c\/h3\u003e\n\u003cp\u003eThe 15.5 oz aerosol size is ideal for spot repairs, small panels and touch-up work where brush-on products are less convenient. The product dimensions and lightweight packaging make it easy to store and transport to job sites.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePart Number: 39683 for ordering clarity\u003c\/li\u003e\n  \u003cli\u003eCountry of Origin: United States\u003c\/li\u003e\n  \u003cli\u003ePackage size: compact 15.5 oz aerosol for targeted repairs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: SEM 39683 Grey Self Etching Primer is aimed at professional autobody technicians, collision repair shops, restoration hobbyists and maintenance crews who need a reliable, single-step primer to promote adhesion on bare metal. If you perform small-scale metal repairs or want a portable, ready-to-use etching primer for spot work, this aerosol delivers convenience and consistent performance without the complexity of separate etching processes.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this primer suitable for aluminum?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—SEM 39683 bonds to many bare metals including aluminum, but test a small area first for best results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How long before I can topcoat after spraying?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Allow the primer to flash and dry per instructions; typically wait until the surface is dry to touch before topcoating.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"SEM","offers":[{"title":"Default Title","offer_id":48086062956702,"sku":"B000GTIRAU","price":49.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/sem-39683-front-can.jpg?v=1785883311","url":"https:\/\/northtrailauto.ca\/products\/sem-self-etching-primer-grey-15-5-oz-high-adhesion-metal-primer-for-spot-repairs","provider":"North Trail Auto","version":"1.0","type":"link"}