Homemade refractory cement in a bucket based on these plans. The outside of the bucket remained at 75F while the inside cooked at over 1200F for about an hour. Two aluminum beverage cans yielded a lot of dross and little molten aluminum. Still fun. We’ll do it again with more coal and cans.
Bonus fail: We had a PVC extension tube hooked up, but I forgot to turn down the temp on the heat gun. Heat guns are great for bending PVC, which is fun when intentional. 🙂