true, but your holes should all be drilled before you paint

LOL!!!
Like I say, I base with a 2 part primer, that seals the fiberglass completely, or a clear. Then I use the single part because it is so much easier (not to mention cheaper and lighter) to use. then clear it all. If you should need to drill a hole, just wipe the edge with some thick CA after you drill it, it will seal it all.