Frank,  I searched for plaster and got this g-mail for 50%  plaster/
50%starch and the link for the commercial  grade
Aquacore.
george  grimes

You can use oil based child's modeling clay to make molds of many complex
parts in epoxy. The side against the clay can be so smooth as to be shiny. I
 used it to make extra bypass runners in McCulloch Kart engines. Pour on
the  epoxy and after it hardens, rinse out the clay in the cleaning tank.
Devcon  plastic aluminum stands up to the heat as well. Intake bells and short
runners  are easy. For less complex parts you can spin up a maple form on the
lathe. Sand  it smooth and wax it with Johnson's paste wax. Also good for
making identical  intake horns.

Lynn E. Hanover


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