I have used Powder coat powder for tinting PR and it does work ok . The only complaint I had with it was it's a pain to mix in , it clumps and takes allot of stirring to break up all of the little clumps which introduces allot of air . I now use powdered mica pigments from Coastal scents which mix like a dream , never any clumps to break up , and they have a rainbow of colors including micas , glitters and pearls .