RUTLAND Furnace Cement is premixed and ready to use, making it one of the easiest cements to apply. Use this smooth consistency cement to bond and seal metal to metal or metal to masonry joints less than 1/8″. Fix a crack, seal the collar to the top of a wood stove, or seal between firebricks and prefabricated fireplace. Use this cement anywhere a quality high-temperature adhesive is required for furnaces, firebrick repair, filling gaps, sealing joints, or gluing ceramic logs. Adheres to metal, stone, and firebricks, creating a permanent smoke- and gas-tight seal.