3M Fastbond Insulation Adhesive 493M Fastbond Insulation Adhesive 49 is a water-based, high solids, fast tacking, pressure sensitive adhesive for bonding lightweight materials like fiberglass insulation, felt, shoddy, paper and other materials to metal and many other surfaces. DetailsFast aggressive tackPasses ASTM E-84Apply to one surface and save timeGREENGUARD™ and UL certifiedBond lightweight materials