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Painting Over Plastic - Q About Adhesion Promoter

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Need some advice. I'm painting an early 1990's Yamaha motorcycle with plastic fairing and fenders (not fiberglass - they are thick and bendable). It's almost the same stuff you see in 1980's GM bumper fillers/extensions


I will prime and then paint using a urethane single-stage color.


I know I need to use an adhesion promoter. Questions:

  1. Do I use the adhesion promoter under the primer, or after the primer and before the color coat?
  2. Is there a particular brand of adhesion promoter that works best? I've heard that DupliColor is better than Bulldog. 
  3. Any other advice?


Thanks in advance. 

Edited by RansomEli (see edit history)
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