Thank you very much for the input guys,the recipe I was looking at came from the backyard casting site, the site has a wealth of info but, the recipe calls for portland cement, thus the crumble effect.would a crushed old toilet work for grog ?
I have fire clay, sand, and, pearlite for insulation,the hot layer sounds like a good idea. Would 72 hours cure time be adequate before a multi stage slow firing ?
O.H. by the way 2 dog, are you one of the 2 dogs over the hill from K falls? If so Ive seen some of your work ..Good of course.
HAMMER HAPPY DUDES Clifford B)