papa follow the instrutions these people have tested what they use . if they say to use ca it will work fine. I f there any small gaps fill with sanding dust add thin ca and watch it smoke . the wings are OK! use glass tape in center for strenth ! never broke wing in center . A s long as you have a good fit on all parts Med. or thick CA will work on fire wall . Do not use too mutch glue ! you do not need the weight! and you will not get half the damage if ground meets plane. Have had my LT40 for 6 years give instruction on it . Flies well in wind 40++++++++ repairs fast.