Ok so I'm trying to get the fenders prepped for some rust killer and primer, and I am stripping off the paint on the top. On the underside of the fenders theres a coating of some kind of rubberized sythetic waterproof junk and I want to get it off. Whats the easiest way? Will a regular paint stripper take it off or should I just take out the steel brush on the angle grinder and dig into it? Thanks Richard