I painted my bike one year with acrylic-urethane AmerFlint Paint, I could not scratch or chip that paint for nothing. When I did take it to the blasters they could hardly dull the paint in the first blasting. I had to pay a bit extra for them to blast it enough to get the paint off. They were extremely impressed with how tough the paint was. I am not sure if you can get this paint anymore. I know when I get ready to paint I will be looking for it again. That was the toughest paint I have ever seen.