Sheeting foam cores
Whatever you do, do not use 3M #77 spray adhesive. I am repairing the right inner wing panel of a G&P P38 that I bought at Bomber field in September. I discovered a soft spot under the sheeting and pulled off the sheeting to discover a melted area the size of a grapefruit. Yep the guy who started this plane used 3M #77, and it ate the foam. I never liked 3M #77 for sheeting wings, but I also never heard of it eating foam, that is until I read about it in this forum. Seems the new formula has a foam eating solvent in it, I could still smell it.
Vince