Woodstock Fireview 205 Rebuild

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Clean the gap as best possible before cementing. I suggest getting a tube or two of Hearthstone's fiber-based cement. It's meant for stone.
 
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I wonder if a thick bore syringe could get the cement down into the crack and you could pump enough in to seal.
 
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That's the idea with a caulking gun. They sell the Hearthstone cement in caulking tubes and tubs. That should fill the gap.

 
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