DG Lip paint prep

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Mazda MP3
I just got a used DG lip and wanted to know what is the best thing to get the used paint off. The old paint is scratched and chipping, so I want to get all (or as most as I can) off and paint it fresh. I am concerned about using regular paint thinner since I am not sure of the effects it might have on the lip, since it is made out of Urethane. Also, is there any kind of special primer needed for prepping Urethane? (drinks)
 
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