I have/had a case of 3M 90 high strenght spray. It eats the foam on contact. I tried to come up with a way of using it. I found that if I thin Titebond to a mix of 50/50 with water it puts a skin on it and I can use the 3M 90 without damage to the foam.

On a 64 inch wing I had to glue up two pieces for each core. So I had to coat four sides and the weight increase was less then a 1/2 oz from the Titebond. The 3M 90 is some strong stuff, I tried it on some ply wood and the wood gave way before the glue.

Dru.