My tip of the day: Metal or rust treated with 2 coats of Masterseries oxygen-blocking, moisture-cure aluminum primer will never rust. Coupled with their AG111 gloss black epoxy finish, and the treated areas will be saltwater proof. FAR exceeds POR15 performance. Chuck Piskonski in Plymouth CT is one of the most respected german car restorers in the world - and the nicest, most honest guy youll meet. This stuff is incredible. Email him to try some and youll see.