3M77 releases in the hot sun, it releases a gas between the balsa and the foam and the sun re-activates the adhesive. You will begin to see ripples under the sheeting when it begins and it migrates from there. We experimented with the 3M77 on planes up to 35% years ago,..not good! The little .40 size planes did just fine with smaller amounts of wing area.

Bholsten