So I tried to make a forge by cutting the top off a propane tank, lining it with ceramic insulation and coated it with furnace retort cement. Have one 3/4 brass inlet pipe and have been trying to use a benzomatic twist flame torch from home depot. But it is not getting hot enough. Is the hole to big? I mean it is a big hole and I made a lid but still not enough heat. Or is the flame not enough? or both. Should I just rip the wool out an start over? Or is there no way to use that torch to get hot enough?