. . . sorry the first post didn't appear. I'm just finishing my first propane forge made from a 5 gallon can. I modified it slightly so it is no longer a cylinder, but is now a vaulted arch. The floor consists of two -1" layers of kaolin with a 1.25" firebricks on the top of this. 3.25 total inches. The arches are 2-1" kaolin layers. The vaulted roof chamber (8" span, 4" high) seems to be very stable. Will it stay this way with heat. I already have the 'rigidizer' so now all I have to do is apply it and dry it. But I really don't understand the reason for it. It is said that it reduces the insulation value slightly. I take it for granted I would be safer to go ahead and apply the rigidizer, just for drill, if nothing else. Any input appreciated. .. ..in advance, thanks.
15 years ago