OSI F38 Heavy Duty Drywall Adhesive is a solvent-based low-VOC formula specifically designed for adhering drywall to structurally sound surfaces in residential applications. This “no sag” drywall adhesive is formulated for bonding gypsum board to wood or metal studs, laminating gypsum board to gypsum board and bonding gypsum board to concrete or block walls. OSI F38 Heavy Duty provides sufficient open time for the positioning of gypsum panels and will allow up to 50% reduction in the use of mechanical fasteners generally required in applications without adhesives. Meets ASTM C557 standards. OSI F38 Heavy Duty is a solvent-based adhesive that can be sold in all 50 states.