Compared to green sand, oil sand is finer because the grain size of the grouting powder is much finer than sand. So this sand will make it possible to make molds with finer details.
It is the oil that holds the sand together, so there is no evaporation over time, so this sand keeps better than green sand.
When pouring, the oil will burn, which gives off a lot of smoke and the mold may also catch fire, this is normal.
After casting, the sand near the part has burned and is therefore no longer usable, on the other hand the sand whose oil has not burned can be used again, but it is always better not to mix with new sand .
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