Release Agents

Sometimes, as when using a mold, polymer clay tends to stick where it shouldn't. Remembering to use a release agent makes life much easier

The following list includes just some of the release agents polymer clay artists and hobbyists have used:

• Water-- This is the cheapest alternative and a favorite, because it won't build up in crevices like other agents do. Water works especially well for detailed molds. Water is a good release for Premo and Sculpey, but isn't generally recommended for Fimo and Cernit, which absorb moisture.
• Powders-- There are several powders from which to choose:
  • Cornstarch is a popular choice. It usually washes right off with cool water, though you may want to let the piece cool before rinsing it.
  • Baby powder is another alternative. However, some people think that this leaves a residue, even after washing. Residue, if there is any, can be sanded or buffed away.
  • Baking soda may help control odors during curing.
  • Mica powders, metal pulvers, embossing powders, and powdered chalk can be used, too, though they generally cost more than the other alternatives.
  • Potato starch, rice flour, and arrowroot powder and other powdered food products may serve as release agents, as well.
• Glycerin-- This can be useful for casting detailed items. Another benefit of using glycerin is that it doesn't affect surface treatments on the clay (like paint or Pearl-Ex).
• Armor-all-- This product is silicone-based. Nothing will stick to it. While this makes it a good mold release, it can complicate things if you want to add surface treatments (including Future or Varathane) to the clay, afterwards.
• Petroleum-based release agents-- Vaseline or mineral oil are sometimes used when making vessels over a form (like an upside-down pot or bowl). Don't use these products with latex molds, however, because they will react with the mold and destroy it.

Related Links

For more information about release agents, visit this website:

Glass Attic: Molds
Compiled by Diane Black
http://www.glassattic.com/polymer/MainPages/molds.htm
Jump down to the section about "Releases".