I have tried many different glues. For numerous reasons that are often well documented in the many glue threads out there, I prefer to use standard carpenters' glues. My favourite right now is Weldbond. I will use it almost everywhere there is balsa to balsa contact, except in the engine compartment where I use 30 minute epoxy.
Weldbond comes out thick, dries perfectly clear in a jiffy, sands very easily, and doesn't seem to get brittle at all. I do not work for this company- I just like the product...
On this build thus far I have also used Sig bond for the wing skin edge gluing and Super-phatic for some of the pre-clamped fuse joints.
Will discuss more about glue use later as I start gluing things together.
-W