Thanks for the tips. Maybe I'll do some strenth tests on some scraps of balsa and ply. My guess is that I'll find that both types of glue are much stronger than the wood. That's a good point about the ability to sand the glued joint down. I'm running into that very problem right now. The balsa sheet on the last bay on the left side of my four * 40 wing got crunched when someone knocked something over onto it (not me). I lined up all the sheeting and then wicked thin CA through the spot. Now it's hard as a rock and there's no way I will be able to sand it down before I cover it. And the wing is now unbalanced too. I'm debating whether to just cut off the last bay as many have done with their four * 40's or whether I should cut out the offending piece of sheeting and replace it. Any suggestions?