lashup50 posted:"I think back in the day I used Elmer's White and didn't have a problem adhering the styro to plywood, if that's what you're trying to do."
I'm referring here to the pink foamboard insulation, not the white styrofoam.
Gorilla Glue and white glue and yellow wood glue will all adhere well to both construction foam and styrofoam. Both these foams are made by mixing styrene monomer and a foaming agent. Construction foams have more styrene per cubic inch and less foaming agent thus are denser. Chemically they are nearly identical to the plastic in model kits though the foaming agent may leave behind it's traces. The problem with using White glue and yellow wood glue is the water in them must have a path to escape wood and cardboard will supply an adequate path for the water to escape. The problem with Polyvinyl acetate "white glue" is it is not very resistant to moisture. Yellow wood glue "Aliphatic resin" is more resistant to water once cured. If I am gluing any foam to cardboard or wood I will use yellow wood glue instead of white glue. When gluing foam to foam any water in the glue will have a difficult time escaping and the joint will take a long time to cure. This is when I switch to Gorilla glue "Polyurethane glue" in fact a little water vapor will facilitate the cure. Huff your breath on the mating surfaces just before joining. This stuff will foam up and adequate means of clamping are called for. It is great for filling gaps. Good article on wood glues though much applies to gluing in general. j
