There are many kinds of mold releases available, from the simple vegetable
spray that can be picked up at your local grocery store to the high-tech
silicon sprays. The release provides a barrier
between the master mold and a casting. Once the mold is dry, this barrier
makes it possible to part the master and the casting.
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Vegetable Oil - Available in any grocery store. Just make sure it is not
water soluble. Olive Oil is our personal favorite.
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WD-40 - We have not used WD-40 but we have heard of someone using it and
having satisfactory results.
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Liquid PVC - Vantico's RP 802 Green Sealer is a great final sealing
agent. We use this on all of our wooden master molds. The RP 802 is a PVC
material. PVC is short for polyvinyl chloride. PVC in its solid form is what
most of our water pipes are made of. Sprayed or brushed liquid PVC dries in
a few minutes and creates a plastic barrier between the master mold and the
casting. A smooth plastic barrier works really well for releasing and we
still use a liquid releasing agent.
