I am in the process of painting a 1986 Monte Carlo and have 2 small side windows from the rear that has aluminum sandwiched between 2 pieces of rubber. The back side says pvc, My question is do I spray adhesion promoter then color or should I use epoxy? I have never painted a rubber type before and am not very knowledgeable on the subject. I know you guys have dealt with this before and can point me in the right direction.