Because mineral oil isn't a "drying" oil (it doesn't polymerize in air), it's an unlikely choice for finishing furniture because it stays greasy and will rub of

Because mineral oil isn't a "drying" oil (it doesn't polymerize in air), it's an unlikely choice for finishing furniture because it stays greasy and will rub off on things. More likely is a drying oil, like linseed, or a synthetic finish, like polyurethane or epoxy.