Spray Release

• One way to prevent elastomer from sticking to a mold is to use mold release. Spray mold release is purchased either in an aerosol can or is used in a sprayer. The mold is cleaned, then sprayed with a coat of mold release. The mold release dries, and then the elastomer is added to the mold. This method is simple, but the spray must be reapplied often, sometimes before each molding.
  
  

Wax Release

• Different types of waxes are effective to use as a mold release for elastomers. Waxes are applied in a variety of ways. Some are solid and applied by hand with a cloth, some are liquid and are poured or brushed into a mold and some are thin enough to use in a spray. Waxes vary in their composition, and may require additional steps, such as smoothing after application.
  
  

Additives

• Using additives with an elastomer before it is molded changes the properties of the elastomer. It is possible to use additives that make elastomer less likely to stick to the mold. This is particularly useful in industrial settings, in which a sticky elastomer could cause sticking in other parts of the molding process, creating problems. In addition, while mold releases must be reapplied, an additive is mixed into the elastomer directly. However, additives change the qualities of an elastomer, which may or may not have desirable effects.
  
  

Cleaners

• While most mold release products are designed to leave little buildup, molds require cleaning. Buildup in a mold can distort the shape of the final product or cause imperfections. Cleaners for molds that are designed to remove mold release products are available. Cleaning a mold regularly, regardless of buildup, is good for maintaining the mold as well as ensuring the high quality of the molded item. However, it is important to choose an appropriate cleaning agent to avoid damaging the mold.