Why use something that is going to melt the foam if you get it on too thick? I swore off 3M #77 years ago when I switched to epoxy and Dave Browns contact adhesive. Now the only thing I use on foam is Pro Bond. It will not hurt the foam and achieves a far superior bond than any contact adhesive or epoxy. It hot wires well also, because it's a foam. Just don't inhale the vapors.

Vince