Step 4: Making the positive

Picture of Making the positive
The walls of the positive should be made from a nonporous material as to not stick to the silicone once it has dried. I recommend acrylic for this step, but really any nonporous material should work (glass, metal, etc.)

Once the positive housing is made, glue the tetris blocks to the bottom using a hot glue gun.

To prevent the silicone from sticking to the wooden blocks coat each of them in olive oil, or a non-sticking substance specifically designed for your exact type of silicone.
Remove these adsRemove these ads by Signing Up
Nicklogan8 years ago
Another type of silicone release agents is vaseline(thin coat and dried a little bit with a hair dryer). Crystal clear(used the special effects industry{found in any art store/walmart}), spray paint would work to use as a release agent but i would avoid this when using it in a food related project. If using this with food I would use olive oil like stated in the article or Pam spray which works and is easier to apply.