Premixed, ready-to-use high temperature silicates. Multi-purpose cements for bonding and sealing both masonry and metals with working temperatures up to 2000 deg. F. Designed for patching or repairing cracked or chipped firebrick and mortar. Effective in resetting and cementing furnaces, stoves, chimney colars, boilers, and duct work. Not intended for exterior use. Gray.