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I have the Xenon body kit and I was wondering if urethane could be molded to the car? I know fiberglass is easy, but I've heard that urethane can be molded, and that it can't. I'm wanting my sideskirts and rear to be molded. Can it?

 
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Maybe. Although the difference in thermal expansion will be enough that the joints will crack over time. plastic + metal + heat = crack

 
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I am not sure if i can be done or not. I guess anything is possiable.
The thing about the expansion would be as Grey said, but I am not sure what would happen as the Urathane becomes very flexable as it heats up. You might want check with some shops that deal in that stuff.

 
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I had my urethane sideskirts molded so the answer is yes.