Interlux Primocon Metal Primer Gallon"primocon metal primer gallon" Suitable for all underwater metal surfaces, Primocon is a superb anti corrosive primer that creates a barrier to reduce pitting. Its an excellent primer for antifouling paint over sanded fiberglass, and wont affect the color of antifouling paint itself. An anticorrosive primer for underwater metal surfaces including hulls, running gear, and the lower units of outboards and I O's An excellent primer for antifouling paint