has anyone ever made one? it seem's like a decent idea so i decided to try it. i already sort of started, i lined the inside of an old steel elbow plumbing thing with cement (this, but older. Google Images)
Do you even know what concrete is? Not only can it explode/crack if there is any moisture/air pocket's in it and I am almost positive you would be inhaling some pretty nasty chemicals as you heat up the concrete. Not to mention some concrete has additives that make it stronger. Especially low grade hardware store shit, probably not the best.. maybe if it was industrial stuff where it would actually be strong lol..
