RE: Making up foam wing balsa sheeting
I've been using polyurethane glue on all my foam parts lately with very good results. With poly glue, edge gluing the sheeting first is not necessary. The poly glue expands as it cures and will expand into the seams of the wood. I simply tape the sheets together for whatever part I'm trying to skin, then I tape the seams of each sheet to prevent the glue from foaming through.
Some guys like to then use weights to glue the skins on......i prefer to use a vacuum bag. It's quick and easy....takes me about 30 minutes to tape, cut, glue and bag both sides of a wing. Once in the bag, I let the part set overnight, or about 12 hours.