The subframe of my Camaro is done in black chrome powder coat and it is not as durable as say plain black powdercoat. They warned me that it is u.v. sensitive and I found that if you try to rub or polish a blemish, it gets blotchy. Maybe it should have been clear powdered coated afterwards.

Yes, any "chrome" powdercoat needs to be clearcoated to protect the finish. We learned the hard way on a display my company built, we used something like that. It was extremely fragile and if someone got a solvent on it, it made a permanent black mark which really looked bad.

Advanced Plating is Nashville is a stellar operation. I had a bike frame powder coated there and it is still looking good.