OK guys, got a question, correct me if i'm wrong, but don't most paint companys suggest that you use epoxy primer on bare metal and then use high build urethane primer over your bodywork to block sand with? The reason i ask is because i got a couple of bodymen telling me that you should use etching primer first. But i read that some epoxys and urethanes can react to the acid base(etching) primers. So it is safer to start with epoxy from the ground up. What do you guys think?