Do as Brett suggests , then add fillets, or install wing bare, then cover within 1/8" or so of fuselage, then add fillets. The fillets will adhere to the bare wood also, and still seal the covering. This lets the covering bond to the bare wood better than painted surfaces, and seals the edges of the covering down. Every plane I have done this way is still functional and covering still attached.
Type at you later,
Dan McEntee