A couple of tips for painting the tail light grilles: one way to do it is to clean them thoroughly, then spray paint them without taping the ribs off, only at the license plate lenses. Once the paint is dry, carefully rub the black paint off of each rib with 0000 steel wool, and take the tape off near the license plate lights. The other way is to tape off the area near the license plate lights, and use pinstriping (or masking tape cut into small strips) to mask them off before painting. The third way, which I have not personally tried, was to use the first method I described, but use a rag wetted with brake fluid to carefully wipe off the paint on the ribs.