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Plain old hot rolled steel will work fine for short run permanent molds.
Some preheating of the mold is helpful to get started so that the castings
won't freeze short. Once the die temp has reached equilibrium no extra heat
is required. Die casting spray release will help too. Don't forget to leave
2 to 3 deg.of draft. It might be easier to buy 100 lbs of petro-bond and
sand
cast. It gives great detail.

Donald Warner

Don't let the facts interfere with your prejudices
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