if it is a used part like a bumper body part they get striped no new paint on old painted parts less i painted it the first time
Hmmmmm. You had problems with wrinkles or something? I've seen old repaints wrinkle if the base is applied too heavy or using the wrong thinner and the the base lays wet on the surface too long. Usually there is never a problem with old oe paint. If I'm in doubt about the old paint I'll seal it. There's nothing wrong with stripping it I guess but if the paint is in good shape, why? Over the last 20 years I've skipped that step. Personal preferance I guess.