I was watching worlds fastest indian the other day, and i thought about the scene where he casts a piston with an old blow torch. I have an old gasoline blowtorch! So I scrounged up some OHC journal caps and a wheel hub dust cover for a crucible, and a welding tank cap for a mold. Presto, nice aluminum ingots! Now i need to whip up some casting sand and mold something useful. Anyone got a DIY recipe?