Sooooo, I've done thin cut panel lines with black, grey or white monokote, cut with the monokote pinstriper. A long time ago, I learned they don't exactly hold up forever. So I sprayed over them with Topflite lusterkote crystal clear. They held up great, except if you need to touch up or repair. Then shrinkage is a factor. Otherwise, those Topflite panel line pens with Topflite lusterkote crystal clear worked really good.