unless a crack is very deep ignore it. if you must repair one make some more mix or thin some left over.
I used fire clay from a fireplace store, two big bags for 15.00. works great.
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Just remember what ol' Jack Burton does when the earth quakes, the poison arrows fall from the sky, and the pillars of Heaven shake. Yeah, Jack Burton just looks that big old storm right in the eye and says, "Give me your best shot. I can take it."
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