Let us know how it works out.

The reason I asked is because the gas refractory is totally diferent than a charcoal forge insulator. Gas requires a much more sophisticated lining than a charcoal forge. Gas heats the refractory and the radiated heat heats the steel. Charcoal heats the steel directly. I experimented with some homemade gas castable refractories and everyone of them sagged or melted at a welding heat. I've had the best luck with the KAO wool and slip, but have often wondered if you could saturate some other material like cotton or berlap with porcelain and get about the same reasults. The fiberous material would burn out and leave a light weight ceramic that could expand and contract upon heating and cooling. One time I made a tuyere tip out ciggarette butts and the slip, which seemed to work fine for that.