Hi Terry, that slightly grainy texture on the plastic cover complicates things doesn't it? Have you thought of using Carl Goldberg vinyl trim tape? I used some on a HT tank once and Krylon clearcoat over that and the two tone paint job. Worked good. Also, I found some 3M vinyl masking tape at the auto paint store. It's blue in color. Best I've ever used. Super crisp lines even without clear to seal. Just pull it slowly straight back on itself, not up. That is if you're commited to painting. Good Luck