Pokemandela Posted November 19, 2017 Share Posted November 19, 2017 Hello. I am trying to build myself a gas forge. And i have no idea what to use inside it. I have read about using perlite, concrete and sand, and other tings and later on reading somewhere else that thats no good. What do you guys recommend? Preferably something castable. Quote Link to comment Share on other sites More sharing options...
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