Mixing The ‘Casting’ Plaster—Hydro-Stone or Hydro-Cal
How to mix plaster, using the old-fashioned landfill method. 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.