Looks like I will be building a small forge. Where I live fire brick and any heat resistant blackets or batting is next to impossible to find. So I'm thinking about making my own insulation. I'm thinking about a 5 gal. Metal bucket with a port in the side that will hold my 220000 btu tiger torch. For the liner I was thinking about a mixture of perlite, sand, potters clay and plaster of paris. I'm not too concerned about longevity because I wouldn't have much invested in it. I plan to make 3-4 knives. What do you Guy's think ??? Any thoughts or suggestion would be appreciated.