Looking to color match my grill surround and trim. Its plastic that is chrome plated. I scuffed it with 320 grit sand paper and painted it with and without primer. I used summit white paint in a spray can from nappa. The paint comes right off if I run my finger nail over it. I dont see how it will last when I go to scrub bugs off.Should I try and sand blast the the chrome of first? Should I used krylon fushin for plastic? Whats the right way to do this?