Help! I'm on my second guitar build. My first build was done as part of a class. We cut the neck blank, cut the fret board, cut the fret slots and glued the fretboard to the neck all in the same day. If the wood wanted to move, it didn't have much time to do so before it was glued. This build is my first one on my own. I am doing inlays on the fretboard and binding it. The plan was to do all of this before gluing it to the neck blank. I thicknessed the fretboard, sanded it dead flat on top and bottom, and cut the fret slots about four days ago. Given the holidays, I did not get back out to work on the inlays until today. After working on it for a while, I noticed that the fretboard is no longer flat. When you look at the short ends, it is cupped, with the edges curving up and the middle being lower. The weather has turned pretty cold (for Houston! ) over the past few days and I don't know if this played a part. Is there anything I can do about this short of sanding the top and back flat again? Since the fret slots are already cut, I am afraid of making the board too thin and prone to cracking along the fret slots. In the future, do I need to do all of the fretboard work and glue it to the neck blank in the same day? That would be pretty hard considering this is a hobby and I can't spend all day working on it.