Sea Hawk Tuff Stuff Gray Epoxy Primer Sea Hawks Tuff Stuff High Build Epoxy Primer dries fast and is able to complete a barrier system and bottom paint in just two days. Microsheet silicate technology allows the epoxy to build a 100 water barrier that protects the surface from water penetration and moisture. Can be used on aluminum, bronze, stainless steel, cast iron, and lead both above and below the waterline. Effective on fiberglass or bilge coating as it helps prevent blisters and is resista