A sand casting facing composition comprises a dry mixture of
about 77% fine sand, 5% binder, 6% green system sand and 12% burned
system sand. The fine sand is mulled with 5.8% wt/wt oil per total dry
mixture and catalyst at about 0.5% wt/wt. Preferably, fine sand and
binder are mulled with oil, catalyst, green system sand and screened
burned system. The mulled mixture is rested, mulled again and rested
again before use as facing sand for achieving accurate reproduction of
the pattern's fine detail. A method of preparing the mold and preserving
fine detail comprises riddling the pattern with a thin layer of the
facing sand composition, compacting, riddling with dry system sand and
riddling with system sand before compacting about the periphery of the
pattern. Final layers of system sand are applied and compacted over the
entire pattern.
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