Fix Fireplace Mortar Joints

Heat-resistant fireplace sealant can be used to easily fix cracked mortar joints inside the fireplace.
Fixing / grouting damaged seams prevents the fire and heat causing damage the the fireplace structure.

[@MikkoAuvinen]

Yes I did 🫤 I left it in the video as warning for others not to do the same mistake (at 2:20 )

[@ddawg6482]

You damaged one of the fire bricks with that violent chiseling technique