WHAT IS A SURFACTANT
Surfactants work by reducing the surface tension of water. If you’ve seen water droplets bead up on a hydrophobic surface, like the hood of a freshly waxed car, you’ve seen surface tension in action by the ‘bubbles’/ beads of water that appear.
To reduce this, you will need to spray your mold with a surfactant, which wets the surface and creates improved contact between the plaster and the surface of the mold, making it bubble free.
Mixing The ‘Casting’ Plaster—Hydro-Stone or Hydro-Cal
This is the easiest way to mix. The manufacturers recommend that you mix plaster by weight. For example—5 lbs water to 8 lbs. plaster. To alleviate all the measuring, the landfill method, is the easiest and nearly fail proof.
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