This kit is specifically designed for painting underwater metal running gear. can be used on props, shaft, struts, props, trim tabs, and thru hulls. All Pettit antifouling paints are compatible with this kit. It combines both 6455/044 Metal Primer and 6627 Tie Coat Primer. Can be used on underwater metal running gear, including steel, stainless or galvanized steel, bronze, and aluminum.