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I've always used Masonite siding, ripped down to 4". Works until you bend it too much. I've been able to use the steel forms before. They work good. I don't have any though. Borrowed them.
We use "Clean strip" on the forms. Works good. 5 gal bucket lasts a long time.
 
I have a bunch of 1/4" by 4" by 8' strips of HDPE plastic I cut up from my snow plow. It will bend down to a radius under 12", and cleans up extremely easy w/o any release. For less aggressive curves, we use these forms. Some of the best money I've spent, bought 3 or 4 sets over the last 10 years and I don't think I've had one form replaced yet. I think they've paid for themselves, likely a few times over.......

http://www.metalforms.com/P/21/concreteCurbForm
 
21 - 25 of 25 Posts