To release silicone rubber from silicone rubber, use a release agent that does not contain a significant amount of silicone oil.
Mann’s Ease Release® 200 was made especially for releasing silicone rubber from silicone rubber and other surfaces. It goes on as a light mist coating and will not interfere with surface detail.
Option: you can also use petroleum jelly thinned with a solvent such as mineral spirits. Make sure you don’t leave brush strokes on the cured rubber’s surface as they will be reflected in the mold.
This FAQ article is offered as a guideline and offers possible solutions to problems encountered during mold making and casting. No warranty is implied and it is up to the end user to determine suitability for any specific application. Always refer to the provided Technical Bulletins (TB) & Safety Data Sheets (SDS) before using any material. A small scale test is suggested to determine suitability of any recommendation before trying on a larger scale for any application.
Smooth-On, Inc. will be closed Monday, September 5th, 2016 in observance of Labor Day. We will resume normal operations on Tuesday, September 6th.