I cannot yet speak on the durabilty, as the car has not been on the road. I will say it is easy to apply(sprayed or brushed). I personally did not thin it at all(was already plenty thin IMO). If you do not absolutely have to spray for appearance sake, definately brush it on. I sprayed it on the bottom(floor pan, inside quarters) of a '56 Chevy and it took most of two quarts to get a couple good coats. I then brushed the topside of the floorpan, inside of firewall and the backside of the dash and didn't even use a 1/2 quart. If you apply it to metal that is rusty instead of prepped(sandblasted), be extremely careful that you do not get the Marine Clean/Metal Ready on any surface that you do not intend to coat with the POR 15.
