Ideal for setting, coating, and repairing firebrick, Seals air and gas leaks around coal or ash pit doors, Extremely effective for masonry-to-masonry joints less than 1/4"" thick, Can withstand up to 2,000º F once heat cured, Pre-mixed for convenient application, May be painted after drying, Meets ASTM E136-79 and E72, Adheres to masonry, Solvent: water, Cement Type: sodium silicate, Consistency: trowelable paste, Tooling Time: 30 minutes, Dry Time: 24 hours, Heat Cure Time: 1 hour, Heat Cure Temperature: 500º F, Coverage: one gallon covers approximately forty-five 4, 5"" x 9"" firebricks, Color: buff, SKU: RTLD314