ORIGINAL: DMcQuinn
I like polyurethane wood glue. Gorilla glue is a brand name. Other manufacturers also sell this type of glue. It looks like maple syrup. Use plenty of weight. I like to get 3 or more pounds per square inch.
OK so on a 500 sq in wing you are stacking on 750 lbs per panel? The problem with using weight is that there is no way to get the weight evenly distributed. If you are going to build a few foam wings per year I would suggest building a vacuum bag system. In most cases you can find all the bits you need for under 100.00.
As for me. I use epoxy finishing resin. I find that Ican get a set of wings that are stronger, lighter, straiter then if I used poly glue. If you need to add glass or carbon cloth to key areas of the wing for added strength, epoxy is the only method.