Fireplace mortar patches cracked or chipped firebrick, or you can use it to fill in missing mortar joints. You can fire it immediately. The final cure requires 1200 degrees Fahrenheitto strengthen the mortar to firebrick hardness. Remember to burn a low fire to dry fireplace mortar, then heat strongly to cure. This repair mortar can also be used on any wood burning stove as well with 2000 degree limit. Don’t use mortar outdoors. This is ideal for holes or cracks not wider than 1/8", larger joints should be filled in layers. The mortar will dry as hard as firebrick if it is properly cured and will withstand 2000°F! This firebrick repair mortar passes ASTM E136 and E72 safety standards.
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