So I took a spare painted scrap and really bent the crap out of it. The only way I could get the paint to come off was by grating scissors across it. any paint would fail that test. My thumbnail wouldn't remove the paint.

Here's the wing, awaiting destructive testing at the track.

The clear sections on the right top of the wing are from the scissors, I have a nasty habit of doing that. Totally normal for this test.