Rutland Fireplace Mortar Patches cracked and chipped firebrick as well as replaces missing mortar in joints between firebricks. Adheres firmly when wet or cured. Can be fired immediately to provide a final cure that strengthens the mortar to firebrick hardness. May also be used on wood burning stoves. 2000 degree F limit. For repairing cracked and chipped firebrick and pointing mortar joints Color of mortar: Buff 10.3 fluid ounces