Never use CA on a wing joint. The joint it produces is much too brittle for this type of stress. Plus, if you don't get it just right, you're screwed!! I usually smear 30 min. epoxy over everything (root ribs, dihedral joiner, TE joiner, whatever will be touching each other!). Then, squeeze together firmly while a helper wipes excess with alcohol and towell. Then, wrap masking tape around the whole thing (tip to tip), and then place some smaller pieces of tape across the joint (three or four on each side should do). The first time I used the tape technique was this weekend when my dad showed it to me. Works great! Have it supported for an hour or so while it sets up, then you can put it on a shelf or whatever overnight while it continues to cure out. Also, on the one I just did, we used one of those wood pecker things that you use before you cover a plane to make small indentions in the root ribs--to give the epoxy a little more surface area to grab ahold of. I really like that idea. Not too much pressure, though!