{"product_id":"sem-self-etching-primer-aerosol-black-15-5-oz-metal-adhesion-first-step","title":"SEM Self Etching Primer Aerosol - Black 15.5 oz | Metal Adhesion, First-Step","description":"\u003cp\u003e\u003cstrong\u003eSEM 39673 Black Self Etching Primer is a 15.5 oz aerosol primer formulated to deliver the first-step etching adhesion layer for bare substrates before topcoating.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis self-etching primer from SEM is designed as the initial coat to improve the bond between bare surfaces and subsequent paint layers. Supplied in a convenient 15.5 oz aerosol can, it simplifies preparation for repair, restoration, and refinishing work by creating a chemically active surface that promotes strong adhesion on metals and other unpainted materials.\u003c\/p\u003e\n\n\u003ch3\u003eWhat surfaces does this primer help prepare?\u003c\/h3\u003e\n\n\u003cp\u003eSEM 39673 is intended for use on bare substrates where direct adhesion of a finish coat can be challenging. It’s commonly selected for uncoated metal and similar materials that require an adhesion-promoting base layer.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSuitable for bare metal and other unpainted substrates.\u003c\/li\u003e\n  \u003cli\u003eFunctions as the first-step etching primer prior to sealer or topcoat.\u003c\/li\u003e\n  \u003cli\u003eHelps reduce the risk of premature paint failure on untreated surfaces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I apply the 15.5 oz aerosol for best results?\u003c\/h3\u003e\n\n\u003cp\u003eFor consistent coverage, apply the aerosol in controlled, overlapping passes and allow the primer to flash between light coats. Keep the can moving to avoid runs and build up a uniform film before topcoating with compatible products.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eShake the can thoroughly before use to mix contents evenly.\u003c\/li\u003e\n  \u003cli\u003eApply multiple light coats rather than one heavy coat for even adhesion.\u003c\/li\u003e\n  \u003cli\u003eAllow recommended flash\/dry time before sanding or overcoating.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan this primer be used under my regular paint system?\u003c\/h3\u003e\n\n\u003cp\u003eYes—SEM self-etching primer is formulated to be a preparatory layer that improves the bond of sealers and finish coats. Always confirm compatibility with your chosen topcoat and follow any manufacturer guidance for sanding or sealing steps.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eActs as a base coat to enhance topcoat adhesion on bare materials.\u003c\/li\u003e\n  \u003cli\u003eWorks best when followed by appropriate sealer or finish products.\u003c\/li\u003e\n  \u003cli\u003eCheck product data sheets for specific compatibility and overcoating windows.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? SEM 39673 Black Self Etching Primer in a 15.5 oz aerosol is aimed at automotive and industrial refinishers, technicians, and DIYers who need a reliable first-step primer to improve adhesion on bare substrates. If you frequently prepare unpainted metal or similar surfaces and want a portable, easy-to-use etching primer before applying sealer or color coats, this aerosol offers a practical solution.\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 SEM 39673 suitable for bare metal?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It’s formulated as a first-step self-etching primer to promote adhesion on bare metal and similar unpainted substrates.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How do I apply the 15.5 oz aerosol for best coverage?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Shake well, spray multiple light overlapping coats, let each coat flash, then sand or overcoat per product guidance.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"SEM","offers":[{"title":"Default Title","offer_id":48086283124894,"sku":"B000PKZ3IY","price":49.46,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/sem-self-etching-primer-aerosol-front.jpg?v=1785893646","url":"https:\/\/northtrailauto.ca\/products\/sem-self-etching-primer-aerosol-black-15-5-oz-metal-adhesion-first-step","provider":"North Trail Auto","version":"1.0","type":"link"}