{"product_id":"sem-grey-16-oz-high-build-acrylic-primer-aerosol-flexible-fast-filling-adhesion-for-metal-aluminum-plastics","title":"SEM Grey 16 oz High-Build Acrylic Primer Aerosol — Flexible, Fast-Filling Adhesion for Metal, Aluminum \u0026 Plastics","description":"\u003cstrong\u003eSEM 42013 Grey High Build Acrylic Primer Surfacer is a flexible, high-build acrylic primer formulated to level, fill and prepare metal, aluminum, urethane and plastic substrates for topcoat application.\u003c\/strong\u003e\n\n\u003cp\u003eSEM's 42013 Grey High Build Acrylic Primer in a 16 oz. aerosol gives professional-level surface buildup and adhesion in a compact spray. It’s designed to create a smooth, uniform foundation prior to painting automotive panels, parts and trim made of various materials. The primer’s elastomeric acrylic chemistry provides body for minor surface correction while maintaining enough flexibility for components that expand and contract.\u003c\/p\u003e\n\n\u003ch3\u003eWhat surfaces can this primer reliably bond to?\u003c\/h3\u003e\n\u003cp\u003eThis primer adheres to common automotive substrates including bare and painted metals, aluminum, many plastics and urethane parts when properly prepared. It’s formulated to promote mechanical and chemical grip across mixed-material jobs typical in collision repair and refinishing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSteel and bare metal: cleans, etches slightly and bonds for topcoat adhesion\u003c\/li\u003e\n  \u003cli\u003eAluminum: formulated for good adhesion after proper cleaning\/deoxidizing\u003c\/li\u003e\n  \u003cli\u003eUrethane and many plastics: use adhesion promoter when required\u003c\/li\u003e\n  \u003cli\u003ePreviously painted panels: scuff, clean, and apply for uniform primer coat\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does it help achieve a smooth, paint-ready surface?\u003c\/h3\u003e\n\u003cp\u003eThe high-build formula lays down a thicker film than standard primers to fill light scratches, pinholes and minor surface imperfections. That reduces the amount of wet or dry sanding needed and produces a consistent base for color coats and clear coats.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHigh-build film levels shallow imperfections fast\u003c\/li\u003e\n  \u003cli\u003eSands readily to create even feather edges and smooth transitions\u003c\/li\u003e\n  \u003cli\u003eReduces multiple filler applications on small defects\u003c\/li\u003e\n  \u003cli\u003eCompatible with most basecoat\/clearcoat systems when topcoated per instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I apply and finish the SEM 42013 primer?\u003c\/h3\u003e\n\u003cp\u003eShake the aerosol thoroughly, apply in light, even passes, and allow proper flash time between coats to avoid runs. Build film in several thin layers to reach desired thickness, then sand with recommended grits before applying topcoat.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eShake can vigorously for at least one minute after mixing ball moves freely\u003c\/li\u003e\n  \u003cli\u003eApply 2–4 light coats, holding the can the manufacturer’s recommended distance\u003c\/li\u003e\n  \u003cli\u003eLet flash between coats and cure per label before sanding or topcoating\u003c\/li\u003e\n  \u003cli\u003eSanding: start with medium grit, finish with fine grit for a smooth base\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre there any performance or handling considerations to keep in mind?\u003c\/h3\u003e\n\u003cp\u003eThe aerosol format offers convenience for touch-ups and small panels, but follow temperature and ventilation guidance for optimal film formation. Use appropriate personal protective equipment and observe surface prep steps to maximize adhesion and finish quality.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUse in well-ventilated areas; wear a respirator when spraying\u003c\/li\u003e\n  \u003cli\u003eControl temperature and humidity per product recommendations\u003c\/li\u003e\n  \u003cli\u003eTest adhesion on unfamiliar plastics; use adhesion promoter if needed\u003c\/li\u003e\n  \u003cli\u003eStore and dispose of cans according to local regulations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? SEM 42013 is intended for automotive refinishers, body-shop technicians and experienced DIYers who need a high-build, flexible primer in an easy-to-use aerosol. It’s ideal for spot repairs, trim pieces and small panels where a durable, sandable primer is required before applying color and clearcoat systems. For larger jobs, consider bulk high-build surfacers, but for precision touch-ups and mixed-material parts, this 16 oz. can offers a professional foundation with minimal setup.\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: Can SEM 42013 be used on plastic bumpers?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—on most plastics after proper cleaning and scuffing; use an adhesion promoter for difficult substrates.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How long before I can sand and topcoat?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Allow the primer to flash and cure per label; typically sandable and ready for topcoat within a few hours depending on conditions.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"SEM","offers":[{"title":"Default Title","offer_id":48086159065246,"sku":"B000PKX16A","price":45.09,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/sem-42013-front-aerosol-can.jpg?v=1785887470","url":"https:\/\/northtrailauto.ca\/products\/sem-grey-16-oz-high-build-acrylic-primer-aerosol-flexible-fast-filling-adhesion-for-metal-aluminum-plastics","provider":"North Trail Auto","version":"1.0","type":"link"}