Meeco's Red Devil Gray Furnace Cement & Fireplace Mortar, 1 Quart is a versatile, premixed high-temperature silicate designed for bonding and sealing both masonry and metals. This durable mortar can withstand working temperatures up to 2,000 degrees Fahrenheit, making it i for patching or repairing cracked or chipped firebrick and mortar. It is for resetting and cementing furnaces, stoves, chimney collars, boilers, and ductwork. Please note, this product is not intended for exterior use. Conveniently packaged in a ready-to-use 1 quart bucket, it ease and efficiency for your repair and maintenance needs. Model Number: