Or you can use a polyurethane based glue (Gorilla Glue or Elmer's Probond or Loctite's Sumo Glue). Do not wet the surfaces (I bet that even in AZ there's some moisture in the air). Join the two parts and carefully cover both sides of the joint with mask tape. You will get a very light and strong joint that will be flush with the wing surface.

Serban

P.S. CA usually eats foam. There are some foam-safe CA types, but the joint will not be strong enough (long and narrow type). Epoxy or PU work much-much better.