Metacaulk® 1200 is a single component, highly elastomeric water based firestop mastic for general construction gaps and voids. Metacaulk 1200 caulk grade is a non-sag sealant that is easy to apply from a caulk gun or troweled. It cures to an elastomeric membrane seal that is suitable where dynamic movement is expected. Can be applied to horizontal and vertical surfaces for interior and covered exterior application that cures to a paintable elastomeric membrane seal. Application temperature 40°F to 120°F.  Color: Red.