sasksmith

With a thick layer of the cement can I get by with lower rated insulation ( 2000f) or (2300f) between the cement and the outer shell? Or is a higher rated insulation and thinner layer the better way?

Will a thick wall of high temp refractory cement (5000f) work on its own to line a propane forge? What is the benefit to lining with kaowool?

I'm planning my first shop made propane forge, I can't find kaowool locally, but can get other ceramic high temp insulation. However I have come across reasonably priced high temp refractory cement (5000f), I'm thinking this will work like fire brick. The benefit being that I should be able to patch it with left over cement later when the flux has damaged the inner surface. Any thoughts, advice, warnings?