I don't think it is possible to use too much epoxy when the plans call for it. I have already heard of several ARFS including a few Avistars that had the wing fold in flight. Some due to excessive loading for the type for airfoil/aircraft and others while in straight and level flight after many previous flights which apparently weakened the join. I myself have an Avistar as my first plane and am always worrying about the wing join as the spar is very small and I can't remember if I used alot of epoxy or not much at all, was my first experience with any type of RC building [:-] My new plane a Seduction Wildstyle has a much larger spar, I used a generous amount of epoxy and then I fiberglassed the join. Just my $.02.

ZK