SL-311 500°F Blue RTV Silicone is a high temperature resistance silicone for heavy-duty applications, this fast curing silicone makes perfect gasket that resist cracking, shrinkage and migration cause by thermal cycling, it remain flexible and stable from the temperature of -80°f to + 500°f (–62°c to 260°c), ideal for engine repairing and replacement for paper, rubber and asbestos gasket, such as valve covers, water pumps, thermostat housing, transmission pan etc.