A wholly inorganic glue, water based, which sticks well to expanded polystyrene.
It sets without having to dry in air. It comes in two parts; powder and liquid binder.
Mix the two to any consistency from putty to pourable and it will still set in about an hour or two.
Note; After gluing, you can no longer hot wire cut through it.
It can also be used for hardening the surface of expanded polystyrene. On its own it cracks a bit and pulls the polystyrene, so use it in fiberglass, membrane, scrim or geotextile for high strength.
Development no. 66488