Is there a way around investing in a vacuum pump and vacuum chamber?

Although a vacuum pump and chamber will make your life easier if you are making silicone molds on a regular basis, it is a lot of money to spend on equipment.

Some of our mold makers who do not own vacuum equipment claim that the following method works well to minimize bubbles in their finished mold.

After their silicone rubber is mixed, they will brush a thin coat over their model and then pour the balance of the mixture behind it (off model) over their model.

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.