MH,
My background is in the plastic injection mold making business, quite different background than yours, so I have limited knowledge on how the concrete will want to stick to different surfaces. I have built wood forms for sidewalks, steps, and things like that, I was always taught to spray the wood with kerosene, or diesel feul (no smoking during that stage
) and the forms come off easily.
I have pondered the thought of good, long lasting forms, for smaller items, and based on machining up prototype parts at work, i found that the Delrin (which is a plastic resin called Acetal) machines very nicely. It doesnt ball up on the cutter, and leaves a rather shiny slippery surface. I havent tried the release properties of Delrin with concrete, but have with other resins. In your experience, do you think it would want to adhere to something like this, or release easily???.. I have wanted to try this but have never took the time. (actually Lori, my wife has wanted me to try this
) If you were making dozens or hundreds of an item, I am thinking this could be the ticket to keep from having to make several foam forms... Since you have experience with the concrete forming i would love to know your thoughts?
Thanks!
Ron
.... As Iron sharpens Iron, so one Man sharpens another!