Hi!
MTK is right! Doesn't matter what glue you use if the wooden area isn't large enough.
On such a small and slow flying model like the Elder any glue will work...but see to that the glue area is large enough. Gluing a stab to two 3mm balsa longerones isn't enough! Putting some additional 3mm balsa sticks parallell to the longerons at the rear will be just enough gluing area...and then any glue will work. 30min epoxy or 5min doesn't matter.