Thanks Guy's I'll stay away from the heat then.
I've just got one of the 20 ton tube benders.
So I'll try the sand deal and see how that works.
My tubebender is like the one this guy use's in this video.
It's got the V shape to it, I know it's not the best but I'm on a budget here.

http://www.youtube.com/watch?v=GWT3N3m4bE4
Thanks for your input!!! Kurt