Flue Goo is a multi-purpose furnace/refractory cement. It will bond masonry to masonry, steel to steel, and steel to masonry. Flue Goo will withstand temperatures up to 3000°F without cracking or shrinking. Flue Goo is freeze/thaw stable; however, it's still a good idea to bring it indoors in freezing weather. It comes premixed and ready to use, and is water soluble for easy cleanup. It is not for exterior use.
WARNING: Carcinogens: This product can expose you to chemicals including Lead, which is [are] known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.