{"product_id":"u-pol-grip-4-universal-adhesion-promoter-spray-12-oz-improves-paint-bonding-on-plastics-metal","title":"U-POL GRIP#4 Universal Adhesion Promoter Spray, 12 oz — Improves Paint Bonding on Plastics \u0026 Metal","description":"\u003cstrong\u003eU-POL GRIP#4 Universal Adhesion Promoter is a 12 oz aerosol formulated to improve paint adhesion on plastics, metal, fiberglass and body fillers without the need for heavy sanding.\u003c\/strong\u003e\n\n\u003cp\u003eWhen resurfacing or repairing vehicles, getting new paint to stick evenly across different substrates is one of the most frequent challenges. GRIP#4 is engineered as a universal adhesion promoter that bonds to difficult surfaces—like OEM plastics, galvanized metal, aluminum and existing paint—so finishing coats lay down smoothly and resist lifting or solvent attack. It sprays flat for an even film and is compatible with most water- and solvent-based paint systems, making it a flexible choice for collision repair shops, restorers and DIYers who need a reliable preparatory step.\u003c\/p\u003e\n\n\u003ch3\u003eHow does GRIP#4 improve paint adhesion on mixed automotive materials?\u003c\/h3\u003e\n\u003cp\u003eGRIP#4 contains adhesion-enhancing resins designed to create a compatible surface layer between the substrate and subsequent topcoats. Instead of aggressive abrasion, GRIP#4 forms a mechanical and chemical bridge that helps coatings wet out and bond consistently across plastics, metals and fillers.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAdhesion resin blend for plastics, aluminum, zinc and galvanized steel\u003c\/li\u003e\n  \u003cli\u003eWorks over existing paint and body filler for seamless bonding\u003c\/li\u003e\n  \u003cli\u003eReduces need for extensive sanding in hard-to-reach areas\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I use GRIP#4 without sanding in tight or intricate areas?\u003c\/h3\u003e\n\u003cp\u003eYes — the formula is intended to perform where sanding is impractical, such as inside engine bays, under hoods, trunk lids and complex mouldings. It doesn’t eliminate all prep in every situation, but it significantly cuts down on abrasion when surfaces are structurally sound and free of heavy corrosion or contamination.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eQuick surface prep: clean, dry and degrease before spraying\u003c\/li\u003e\n  \u003cli\u003eIdeal for areas that are difficult to abrade with hand tools\u003c\/li\u003e\n  \u003cli\u003eNot a substitute for removing rust or badly degraded coatings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat topcoats work with GRIP#4 and how should I apply them?\u003c\/h3\u003e\n\u003cp\u003eGRIP#4 accepts most waterborne and solvent-borne paint systems once it has flashed and leveled. Spray a uniform, flat layer from the recommended distance, allow flash time, then proceed with primer or topcoat per your paint manufacturer’s guidelines for best results.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with many modern automotive primers and basecoats\u003c\/li\u003e\n  \u003cli\u003eApply even coats; avoid heavy build-up to prevent runs\u003c\/li\u003e\n  \u003cli\u003eFollow paint system flash\/dry recommendations before topcoating\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat protection does GRIP#4 provide against solvent attack and lifting?\u003c\/h3\u003e\n\u003cp\u003eBesides improving adhesion, GRIP#4 leaves a protective interface that helps reduce lift from aggressive solvents or stripping agents encountered during refinishing. This protective barrier helps maintain paint integrity during subsequent handling and when exposed to typical refinishing chemicals.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eForms a resilient film that resists lifting during spray operations\u003c\/li\u003e\n  \u003cli\u003eHelps coatings tolerate common refinish solvents and thinners\u003c\/li\u003e\n  \u003cli\u003eContributes to longer-lasting finish performance on repairs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? GRIP#4 is designed for body shops, restoration specialists and skilled DIYers who need a dependable adhesion promoter for diverse substrates encountered in automotive repair. It’s particularly useful when working on complex assemblies or OEM plastics where sanding is impractical, and when a versatile product compatible with both water- and solvent-based paint systems is required. Always follow safety and application instructions on the can and consult your paint supplier for system compatibility and drying times.\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: Do I need to sand before using U-POL GRIP#4?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: In many cases no; GRIP#4 is formulated to work on hard-to-abrade areas, though you should remove heavy corrosion or loose coatings first.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I topcoat GRIP#4 with waterborne paint?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, GRIP#4 is compatible with most water- and solvent-based paint systems after proper flash\/dry time.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"U-POL","offers":[{"title":"Default Title","offer_id":48084758790302,"sku":"B00397POFC","price":39.59,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/u-pol-grip4-front-can.jpg?v=1785862001","url":"https:\/\/northtrailauto.ca\/products\/u-pol-grip-4-universal-adhesion-promoter-spray-12-oz-improves-paint-bonding-on-plastics-metal","provider":"North Trail Auto","version":"1.0","type":"link"}