I cast my hearth in segments deciding that the bottom will be the top (A perfect flat finish (like casting for polished concrete) However yesterday I struck the forms and flipped the slabs to find the (now top) concrete is very powdery (apparently I used too much release agent which stopped the curing reaction) I guess I cant seal it as food is going to be cooked on it, Any ideas of how I can sort this mess. Polish perhaps? Thank you
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cast hearth problems (powdery)