The 3M™ Fire Barrier Sealant FD 150+ is an acrylic latex caulk used to firestop metal pipes and cables through concrete or gypsum and is designed for use in dynamic head-of-wall systems.The 3M Fire Barrier Sealant is an economical alternative to firestopping applications. It is used to firestop metal pipes or cables through concrete or gypsum, and for use in dynamic head-of-wall systems. A single-part, sag-resistant, water-based acrylic latex sealant, 3M Fire Barrier Sealant 150+ has excellent adhesion characteristics to most common construction materials. In addition, since it dries to the touch within one hour, it can be painted for a more professional-looking job.