Bubble Buster is a PVA mixture that reduces bubble formation when making your mold. 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.