I remember back in the 70s, people talking about Imron. they were painting tow truck bodies with it because they said you could drag a chain across it without a scratch. When I get my old 68 sweptline truck painted up for camper hauling and trailer pulling duty, I want the paint to be as durable as possible. This truck is going to get worked and I know stuff will happen to it. So what's the toughest paint I can use now that will still look good? And what about repairing it if needed? Thanks, Joel