Excellent adhesion and corrosion resistance to bare metals. For use on properly prepared steel, aluminum or galvanized steel. Specifically designed for underwater metal surfaces including hulls, running gear, and the lower units of outboards and I/O's. It provides an excellent barrier to reduce pitting of the metal from galvanic corrosion. Use in conjunction with another primer such as Tuff Stuff prior to applying antifouling or topcoat.