alright.. heres the deal.. i am building a Sig Extra 300XS 1/4 scale model.. after a few beers i seemed to had made a mistake when putting the wings together i glued the Wing joiner in upside down..

well.. on the top part of the wing there is a gap.. and the spar is not completely touching.. i filled the gap with epoxy to help strengthen the wings.. anyhow, the wing has a little trouble being fit onto the fuse, but nothing that can't be corrected.

well my question here is will this adversely affect the flying performance of the aircraft.. since the wing joiner is made to angle the wings up a bit.. now it is more or less.. straight.. i would be more then happy to buy a replacement wing if i could but don't think sig sells them..

what should i do? and do you think the flying will be fine.. also, how dramatically will this weaken the wing?

The performance will be affected. Whether or not adversely will depend on how you fly the plane.
Having done that error in installation in the past, I've found the cure is to take the part that is accessible and modify it to fit properly by trimming and shimming.
Your filling the gap with epoxy kinda prevents this from occuring now, though.
Next one, pay attention!
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Along this line, filling the gap with wood and epoxy is preferrable to using epoxy only.

well, by inspecting the expoxy i put on, i can kinda Chizzle it outta there.. the gap was too small to really "fill" properly.. you have a good idea there.. ill try to remove the epoxy and put some epxoied shims in there.. would be alot better then whats there now.. wish me luck =)