I've done that three times , and the surface is a bit rough now. And the masking tapes are wearing out. If the boards were not clear, I could sand them for eternity.. I'm going to buy another set of boards, and then do the work from the beginning. I thought that I'd use vinyl stickers if the paint does not work, but I'll have to see.. I am a bit baffled on this, I ruined hours of work in an instant. That I can live with, but what about those projects that I've worked for months, or years..?