Postby Underdog » 21 Aug 2009 17:32
This may sound crazy but I've had good results with sandblasting urethane bumper covers. The sand will take off the paint but for the most part bounces off the rubber leaving it undamaged. There are strippers made for urethane bumpers but my luck with them wasn't good. The paint stripping ability isn't great and they can still swell some plastics.
As for refinishing, there are special adhesion promoters for plastics & urethane. Once they are applied as a tie coat, normal automotive finishes will adhere. The use of a flex agent depends on how much the part will be flexed/distorted. Something like a lid spoiler shouldn't see any impact. Unless the material is really soft and easily distorted with finger pressure, I wouldn't bother with the flex agent.
Like Spyder says, the paint store should help you. Hopefully we helped you to know what to ask for.
Jim Underwood
72 MGB BRG
80 TR8 Persian Aqua
If women don't find you handsome, they should at least find you handy.