You will need to use an adhesion promoter to piant plastic. I've painted plastic parts on several cars and it's never peeled using a good adhesion promoter. Even the one we bought at WakMart, (short on time so we had to) bull dog brand or something like that, and the Duplicolor one seems to be holding very well. It's almost like glue for your paint. The black plasitc side mirrors on my SRT-4 are about the same material as the cladding on our VXs and I used the duplicolor promoter with Mopar paint and even though they are assulted by rocks, bugs and other flying objects there is not one flake or chip.

hope this helps... BR