I find that a 4-1 mix of mineral oil and parafin wax makes a nice finish for cutting boards. Straight mineral oil disappears too quickly, and the wax helps to keep it looking good and resist stains. (I probably just made that last part up).
Basically, it turns into a thick liquid, depending on the temperature and the mixture.
BTW, Buying mineral oil at the grocery store or pharmacy always cracks me up. Prints out on the receipt as 'Laxative'...
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