Irish, I have a quart of Zero Rust here. I preppred a spot on the frame on newer daily driver truck. One side is zero Rust, the other side is Miracle paint from Bill Hirsch, which I believe is similar to Por 15.Give it a look in the spring after a winter of road salt.I used the Zero rust on the frame of one of my old trucks and it looks nice. might be no cyanide but it still stinks like you should be using a respirator.In the past I have used the Hirsch product with excellent results.