Fire Cement is a ready and mixed combination of thermosetting resins and inorganic fillers. When applied and exposed to high temperatures, this combination is capable of healing, which results in a mortar. This mortar is temperature resistant up to 1250ºC. Fire putty is also widely used for sealing against the escape of smoke and flue gases in residential and commercial appliances, such as stoves, chimneys, and central heating systems. How to Use Fire Cement on Flue Pipe? Do not let any unnecessary putty to dry out on the surfaces of the stove or flue pipe. This excessive fire cement can become incredibly difficult to remove later on.

Apart from this, professionals also recommend cleaning all surfaces from dust, grease, oils, and other contaminant substances. You should take a step further and wet all the surfaces before applying the fire putty. How Long for Fire Cement to Dry? Experts recommend using masking tape around the top and bottom of the seal so that a clean straight edge of the heat resistant cement can be applied and exposed to the heat.