M-Flex High Heat Silicone Sealant is an industrial strength product used to seal fireplace inserts, stoves or flashings.
It adheres to glass, metal, fiberglass, aluminum, wooed, brick, slate, most plastics and is heat resistant to 400 degrees Fahrenheit RTV. The M-Flex Sealant is also used to prevent corrosion to copper or galvanized chimney flashings. RTV silicone comes in clear, black or grey. We also stock Red High-Temperature Silicone that is heat resistent up to 500 degrees Fahrenheit.