I decided to use POR-15 on a customer's truck since I've had really good luck with it in the past. I got the entire kit with the metal prep, de-greaser, and paint. Everything was power washed twice, then cleaned with wire wheels, de-greased, and then metal prepped, and then finally the por de-greaser. I painted the entire front of the frame and suspension with the truck in the garage. Fast forward a month the owner wants all the front stuff gloss black. I go to scuff it to top coat it and the por on the engine cross member and inside of the rh frame rail just peels off. Every where else is fine. What gives? None of the por from the firewall back had any issues. I scuffed it all and shot raptor liner over it. I did notice that this por was a royal pain to apply. It was not like the por I've used in the past that covered bare metal pretty easily. This stuff wouldn't stick to some areas in a stroke. It needed multiple and then you had to be careful to not let it run. I don't think I will buy POR again after this experience.