Our 3M™ Fire Barrier Sealant FD 150+ Is A Gun-Grade, Latex-Based, Elastomeric Sealant That Cures Upon Exposure to The Atmosphere to Form A Monolithic Flexible Firestop Seal. When Properly Installed, This Sealant Helps Control The Spread Of Fire, Smoke and Noxious Gasses Before, During and After Exposure to A Fire and Exhibits Excellent Adhesion to A Full Range Of Construction Substrates.