It works by reducing the surface tension so the bubbles rise up and away from the mold surface.
To use: Liberally spray your original part with Bubble Buster after applying a mold release. Pour ComposiMold over your original part to make your mold. Bubble Buster is not intended for use in your mold for the casting process.
Used with permission, copyright 2021 Brey Corp. t/a Hobby Works.