I glued my Avistar's wings together with 5 minute epoxy. It was all I had at the time. When Avistar met Pizzaz in midair, the center rib on the AV broke along the ply, but the epoxy joint held. Should have convinced me to use 5 mine epoxy for everything but prefer 30 minute. You need some working time (at least I do) when joining a wing to make sure everything is aligned, and that you get epoxy all the way down into the wing joiner box.

Andy