Re: Bender Boards
You can use just about anything you want, the key is that it be strong enough and supported enough to withstand the weight of the concrete. The last time I needed bender board I got it at Home Depot in the garden section. They had both redwood and plastic covered masonite strips. The masonite will bend a tighter corner than a wood strip will. Raw masonite will hold up just fine to the moisture from the slab and if it gets rained on after the fact, but I don't know that I'd want it wet before the concrete was laid.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!