I did my lip in rustoleum textured and painted my center garnish with the same, both are plastic, so I guess it should be ok. It's kinda rhino liner looking. Just try to get an adhesion promoter I guess and make sure the surface is real clean..I use alcohol myself.
Also this is really good at promotoing adhesion. Even though all my attempts on painting my interior never went the way I wanted (messed up on sanding texture away), I always had good adhesion thanks to this....
http://www.perfectfit.com/product.as...15979&l2=15342
Basically way I was told to use it is spray the part with that first, wait like 4 secs then do a light coat of paint. Then regular coats after the first about 30secs later. I found that stuff at an automotive paint shop