I think all the bad mouthing Por-15 gets comes from the fact that most folks just slap in on right over the rust and wonder whats wrong when it pops off. No body thinks about the fact that first steel brushing it and then applying the nutrilizer Por-15 sells to kill what remains after the wire brush scrub and then applying Black or Silver or what ever other color Por-15 is selling now with a spung 1 1/2" brushto get an even coat after you stur it up as best you can and let it dry, The application and the metel underneath it will probably last longer then you will. I've chemicly striped rusty backing plates for ah disc conversion on a couple mopars that started life with drum /drum carz and I've kept in touch with the buyers over 25 yearz now and still get good reports every couple years. It's good stuff when you do the preperation AND application right IMHO, Jer