IIRC I saw one of their catalogs that said they had a 'high temp' powder primer a while back (several months, a year???).
The big thing is prep, just like paint. The smoother the part is before coating the smoother and shinier it will be after. Yes you can build up coats to fill imperfections, but you have the same ultimate problem with powder that you do with pain it you get it too thick.
It still has to be CLEAN.
I have heard of so many people that trust the powder to 'stick' by virtue of wraping around the part it has coated.
It's my firm belief that most of the 'bad press' you hear about powder coating is due to that very belief. It's still a coating, you have to get it to stick, not just encapsulate. All of the stories I have heard of the coating 'coming off' that I have been able to speak to either the coater or the customer it's like they are at a faith healing, 'heals the lame helps the blind to see' type stuff.
I hear them talk about 'you don't need primer', 'you don't need much / any prep', 'you don't need {fill in blank with whatever BS claim you care to}'.
Don't get me wrong, I'm a big fan of powder coating, done right.
I know there are people out there that 'get away with' all sorts of things with powder coat, but I'm not that guy (if it's gonna screw up, it'll happen to me).
When I farm out for coating, I bring the shop the cleanest part I can, and have them degrease it, blast it (media, sand, whatever is apropriate) treat it with a phosphoric wash (if it's ferrous, haven't done anything yet that isn't), prime it with a zinc enriched primer, THEN color (and clear if it's getting it).
I have never had a problem with anything coated that way (I try to do it the same way when I do it myself, but sometimes I have to resort to a wire wheel in a drill or a different etch).
Lots more work I know, but, at least to me the end result is worth it.
Only my oppinion though.
