I've used both paint and powdercoat finishes before. The key to how well a finish turns out and if it is as durable as advertised is to follow instructions. Every finish manufacterer provides a tech sheet for their product. If the finish applicator is the kind of guy to crumple up said sheet and do what he wants to do, then he has no right to complain when the finish fails. many finishes cannot be applied over a sandblasted surface without first sanding it to a specified grit. As long as I have followed the tech sheets, I have never had any major finish problems.