I dont know what your friend is telling you, but stripping paint off plastic is a bad idea, Unless it is some cheap spray paint or something, even then a few wipes with reducer is the answer...That should be in a perfect world (and a blank check) be lightly sanded on damage areas, filled with glaze putty, sealed with a tinted sealer (to match topcoat) Scrubbed with a ultra fine grey scratch pad...And painted with a plastic/vinyl paint.