Gray Fireplace Mortar - 10.3 oz Cartridge

This gray, ready-to-use high-temperature cement is specially formulated for sealing and bonding masonry and metal surfaces exposed to intense heat—up to 2000°F. Perfect for repairing cracked firebrick or damaged mortar, it's also well-suited for securing furnaces, stoves, chimney collars, boilers, and ductwork. Pre-mixed for convenience, it’s intended for indoor use only, with a 24-hour cure time at a minimum of 60°F. Once fully cured, it can be painted, making it a practical and long-lasting solution for high-heat repairs.