TotalBoat 2-Part Marine Epoxy Primer 2-Component epoxy primers provide maximum adhesion & improved durability for urethane topcoats on fiberglass, metal, and previously painted surfaces. DIYers and seasoned pros alike get great results with the simple 1:1 mix ratio. The Surfacing Epoxy Primer formula is great for sealing faired substrates ready for topcoat application. The High Build Epoxy Primer formula is ideal for covering pinholing and filling other minor surface defects. Dries fast and is easy to sand. Overcoat with 1- and 2-part urethanes. For use above and below the waterline. Choose primer type, size, and color: Surfacing Primer is available in Quart and Gallon size kits, in Gray and White; High Build Primer comes in a Quart size kit only, in Gray and White. Quart kits include 1 quart base and 1 quart activator; Gallon kits include 1 gallon base and 1 gallon activator.