I have seen videos of people casting aluminum slingshots using lost foam casting. I have read online that you can use a flower pot as a crucible furnace as long as you have some concrete surrounding it. Then you make a foam mold. put that foam mold on a large container and fill it up with sand. Melt the aluminum and pour it in. So far I have these materials: Flower pot Concrete Foam large containers steel can (used as a crucible) a few hundred aluminum soda cans charcoal hair drier dirt Large metal tongs Can dirt be used instead of sand because I don't have any sand. Am I ready to go make a aluminum slingshot or am I missing something?