3M™ fire barrier sealant FD 150+ is an economical, ready to use, gun-grade, elastomeric sealant that dries to form a monolithic flexible firestop seal. 3M™ fire barrier sealant FD 150+ firestops joints and through-penetrations through floor slabs, walls and other fire-rated building partitions and assemblies. 3M™ fire barrier sealant FD 150+, when properly installed, helps control the spread of fire, smoke and noxious gasses before, during and after exposure to a fire. 3M™ fire barrier sealant FD 150+ remains elastomeric and exhibits excellent adhesion to a full range of construction substrates.