RUTLAND STOVO® Stove Mortar is ready to use, premixed, and general purpose for repairing or relining firebrick in interior stoves, furnaces, boilers, incinerators, Franklin stoves, barbecues, and fireplaces. It adheres to metal or masonry and will prevent air and gas leaks around flue and chimney joints, ash pit doors, and small cracks between bricks and linings.