Hi, I closed my dome yesterday. I had difficulty using commercial refractory mortar, HW Mortar Mix 413, and switched to home brew. I have 2 1/2 bags left and would like to use them to add thermal mass. I could use advice about how to do this. Specifically, what if anything should I add to the mix (such as fire brick sludge, sand, etc). Any help is appreciated.
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Questions on cladding