Can I use a PC anywhere there is paint? I mean...for the cars hood, doors, top, trunk, bumpers? I think my bumpers...as most cars bumpers, are plastic...My car is a TSX if that helps. I just read that other forum where he PC'ed into his primer which was shockin.....I have some marring/warping due to poeple's inconsiderocity and have some faint scratches on the front and back bumper....just wanted to know if i can pc them out with ssr 2.5?