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Hi. I built a gas forge from a paint can. A lot of shortcuts were taken to save time and money. Many things were not done quite right according to helpful posts in this subgroup. The forge was lined with a homemade refractory composed of fireclay, grog, perlite, wood ash, and concrete. When it was first built, it could barely weld mild steel. Since it was outside, it eventually rusted through and the refractory collapsed. Even after repairs, it wouldn't weld. Some colleagues wanted to use it, so it looked like time for a new one.
I am building a new furnace out of a keg, essentially following Brian Oltrogge's FIRE-KEG build. Instead of making the walls out of castable refractory as he did, I plan to use 2" kaowool and coat it will about 1/2" high temp mortar to shield it (and prevent any nasty health effects from heating the kaowool). I plan on using just a simple furnace mortar, the type that you pick up at a big box store, but I'm unsure how well it will work being only 1/2" thick. Does anyone have any experience with that? I know that Satanite would be the best option, but I would prefer to avoid that if I can since the cost plus shipping would be pushing my budget. Thanks for any insights!