I've had good luck with Berry's and Xtreme plateds over the years probably firing >5,000 thru my YHM can. I'm really bummed by the failure of PC here. I looked up high temp PC coating and found this which pretty much says the coating just can't take a lot of heat. I'm sure the combustion of the powder charge is above 400F. That article was specifically about high temp coating.
https://www.keystonekoating.com/blog...wder-coatings/