5. Coat the inside of the ask with a petroleum jelly. This will prevent
the stone from adhering to the ask.
6. Invest the partial using regular Buff stone. When stone sets, place
sprues using 3/16” (4.75mm) utility rope wax. Extend the sprue to
the injection port in the ask.
7. Coat the stone with stone separator and bolt the top half of the
ask in place. The utility wax should ll the injection port of the
ask. This will keep the stone from leaking out during the second
half of the investing process.
9
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