Black Fireplace Mortar - 10.3 oz Cartridge

This black pre-mixed, ready-to-use high-temperature cement is a versatile solution for bonding and sealing masonry and metal surfaces exposed to extreme heat—up to 2000°F. Ideal for patching cracks or chips in firebrick and mortar, it’s also effective for resetting and cementing components like furnaces, stoves, chimney collars, boilers, and ductwork. Designed for indoor applications only, it cures in 24 hours at a minimum of 60°F and can be painted once fully cured, offering a durable and dependable repair option for high-heat environments.