As title states, I want to paint the plastic trim behind the license plate because the paint is peeling in some areas, leaving what I think to be plastic chrome. I've never spray painted anything before, so I'm a bit cautious on how to do this. Do I need to sand down all of the paint first so that all of the chrome plastic will be exposed? Also, what spray paint would last a long time. I was looking at the glossy black Rustoleum plastic spray paint to hopefully color-match my Onyx Black LX470. I have no idea on how to tackle this so any feedback would be greatly appreciated.