I am going to re-do the paint on a tool box that the owner had painted to match his new truck, the problem is this thing is powder coated and the paint he had done is peeling off in sheets after only a couple of days. I thought powder coat has just to be scuffed and sprayed much like anything else and I have not had any problems in the past the few times I did paint it but the guy that did this says he will not fix it because he warned the owner it might not stick. The plan here is to remove the peeling paint then CLEAN THROUGHLY since I suspect some type of surface contamination then re-sand with 400 before re-shooting this thing. Is there any special prep required for powder coat? Any particular primer/sealer that works best? Any special steps for painting powder coat? I intend to use Nason single stage urethane.