High temp furnace cement rated to 3000 degrees. Bonds metal to metal, metal to masonry and masonry to masonry. Pre-mixed gray color seal cracks against heat, steam and vapor. Will not shink, sag, crack or crumble. 1 gallon pail. Availability: Usually ships the same business day. 301041URegular price: $29.95Sale price: Copyright © 2008 Chimney Depot Inc. All rights reserved.