Stops penetration of air and water under normal and extreme weather conditions. Seals and bonds to most building materials and is immediately waterproof. The ability to install underwater and in adverse conditions eliminates many weather-related construction delays and makes it possible to dry-in buildings being damaged by active water leaks. Withstands UV exposure for up to 12 months. Service temperature: –70°F to 300°F (–57°C to 149°C) R-Guard EMERGENCY WaterStop is a gun-grade, wet sealant that combines the best of silicone and polyurethane properties. This single-component, silyl-terminated polymer (STP) is easy to gun and tool in all weather conditions. EMERGENCY WaterStop seals and bonds to most building materials – even when submerged in water – producing a durable, high-performance, high-movement, elastomeric sealant. The ability to install EMERGENCY WaterStop underwater and in adverse conditions eliminates many weather-related construction delays and makes it possible to dry-in buildings being damaged by active water leaks. EMERGENCY WaterStop adheres to most surfaces and is immediately waterproof. PROSOCO packages and labels its industrial/commercial products for purchase and use by industrial, professional, and commercial customers. Unless specifically stated on the product package or applicable product literature, PROSOCO industrial products are not packaged, labeled, or intended for sale to individual consumers (ie., the general public). Always read full label and SDS for precautionary instructions before use.