Metacaulk® 1200 is a water-based firestop sealant that comes in three different grades and 2 colors: red and an easy-to-paint white. A spray application of Metacaulk® 1200 provides a fast, economical means of installation for long joint runs. Self Leveling is made for horizontal applications and caulk grade is a non-sag sealant that is easy to apply. Metacaulk® 1200 is also an excellent, fire-rated acoustical sealant. It cures to an elastomeric membrane seal suitable for use where dynamic movement is expected. Sound Transmission Class (STC) Rating 50*. *Tested in a UL 411 wall assembly/section to ASTM E90.