oh ok so wipe it down with paint thinner to make the paint stick,i dont think i want to sand it because it would mess up the texture wouldnt it?Get it sticky/rough first. Either sand it or wipe it down with thinner. That is what I used to do when I did panels, never had a problem.
Yes, forgot to mention that, you need that when painting on plastic.Rough up the surface with sand paper. Clean with Rubbing Alcohol. Spray with an adhesive promoter. spray with color.