Perfect for repairing and resetting furnaces, wood or coal stoves, fireplaces, and flues, Effectively bonds and seals metal-to-metal joints, Heavy-bodied consistency, Provides a durable filling for gaps between masonry and metal, Creates an airtight seal in flue and chimney joints, Can withstand temperatures up to 2,700º F once heat cured, Meets or exceeds ASTM C 199 pier test; pyrometric cone of 16/17 PCE, Pre-mixed for convenient application, Properties:, Solvent: water, Cement Type: silicate, Consistency: thick sandy paste, Air Dry Time: 4 to 24 hours, Heat Cure Temperature: 500º F, Coverage: one gallon covers approximately 10 to 11 sq, ft, with a 1/8"" thickness, Color: gray, SKU: RTLD272