Metacaulk® MC 150+ is an elastomeric, one-component, general purpose, fire-rated sealant and smoke seal for construction joints and through-penetrations. A water-based, non-sag caulking grade sealant that is easy to apply as well as to retrofit. Can be applied to horizontal and vertical surfaces. Cures to a paintable flexible seal. Application temperature 40°F to 120°F. An economic choice for most common applications. Metacaulk 150+ is a acoustic sealant. It cures to an elastomeric seal that is suitable where dynamic movement is expected. In the event of a fire, Metacaulk 150+ will prevent the spread of flames, smoke, hot gases and water through joint openings and through-penetrations. No dilution or mixing is required for use. No special skills are necessary for installation. Metacaulk 150+ is applied with a conventional caulking gun, bulk loading gun or can be troweled from the pail. For large applications, it can be pumped directly from the pail. Metacaulk 150+ is protected in a wet stage as well as in a dry stage against mold growth with a combination of biocides.