Originally Posted by thxcuz
I think this week I'm going to try 2 door's expanding foam tank mold trick. We'll see how it goes.
One thing I should warn you about is the expense of using that method. When you start adding up the materials required you might find it's cheaper to find a tank on ebay or Craig's List.
The advantage is you can build the tank any shape or size you want. The disadvantage is the cost. Check material prices before deciding if you want to try it.