Sure-Grip 404 is a fiber-free, solvent based, synthetic rubber duct sealant. It's exceptional strength, fast drying time, and unmatched flexibility make it ideal for those applications requiring a solvent based sealant. Sure-Grip's low viscosity, no-drip, no-string formulation allows fast application for labor savings and extended coverage for lower installed cost. Sure-Grip 404 is UL 181 B-M Listed Passes ASTM D-2202 City of Los Angeles Approval RR #8069