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Castor Oil is an excellent release agent for natural latex molds that are made for pouring cement.
Castor Oil also has a rejuvenating effect upon natural latex and will usually bring it back to its natural consistency after it has been repeatedly used. Castor Oil is also a release agent between a natural latex mold and a plaster back-up shell.
Make a 10% solution by dissolving one pound of castor oil in nine pounds (approximately one gallon) of alcohol. This is equivalent to 1 US cup of Castor Oil to 11 US cups of Isopropyl alcohol. Brush or spray into mold. ÊFor a release between the rubber mold and plaster back-up shell, simply wipe it on the back of the rubber mold while on the model. ÊAfter the rubber is vulcanized, let the alcohol evaporate and then construct your plaster back-up shell.
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