3M™ FireDam™ Spray 200 is a sprayable material that dries to form a tough, elastomeric coating. This material is used to firestop perimeter joints (curtain wall), construction joints and through penetration openings. 3M™ FireDam™ Spray 200,when installed properly, will help control the transmission of fire, heat, and smoke before, during, and after exposure to fire.