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3M™ Scotch-Weld™ Polystyrene Foam Insulation 78 ET Cylinder Spray Adhesive creates quick permanent bonds on many substrates, including polystyrene and other insulation materials. This spray adhesive features a controlled, uniform spray pattern which is ideal for HVAC, construction and other polystyrene markets. Adhesive foam insulation spray is packaged in a pre-pressurized canister for an easy-to-use, maintenance-free delivery system.