FOSTER® MULTI-PURPOSE ADHESIVE is a high tack, rapidsetting, water-based adhesive for bonding polystyrene foam insulations (extruded and beadboard), fibrous glass insulation and PIR/polyurethane board stock insulations to concrete, masonry, gypsum board and other porous substrates. It is also ideal for bonding fibrous insulations to painted or unpainted steel, galvanized or aluminum surfaces.