Boss 143143 24 oz 337 Construction Adhesive Foam Gun Grade - BOSS® 337 Construction Adhesive Foam Gun Grade is a ready-to-use, single component, self-expanding polyurethane adhesive for clean, efficient and economical permanent bonding of insulation panels and plasterboard in building and construction. One can replaces up to 10 quart tubes of solvent based adhesive. One can covers up to 140 ft² of insulation boards. It has excellent adhesion to most building materials.