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The Pettit ProPoxy Epoxy Primer 4520/4511 is a multi-use premium, two-part epoxy primer that can be used for both interior and exterior applications to seal undercoats and fillers prior to applying ProPoxy Acrylic Urethane. This non-porous formula provides superior adhesion, chemical and corrosion resistance to a variety of substrates including fiberglass/gelcoat, wood, properly etched/primed metal, and previously painted two-part paint surfaces. ProPoxy Primer primes and seals old and new properly prepared substrates, features excellent sanding qualities and enhances the high gloss finish of ProPoxy topcoat.