MATERIALS * Molding plaster
or pottery plaster (I purchased plaster from a building supply company in 50-lb.
You will need fifty pounds of molding plaster
and a single bag of Zonolite or Vermiculite.
Recovered system fines (approximately 10%) are used in the foundry's molding plaster
mix, representing a double cost saving because disposal costs are eliminated and fine sand purchases made unnecessary.
Materials: Clay, small natural objects (shells, seed pods, insect husks), molding plaster
or Plaster of Paris (approximately 3-5 lbs.