Similar to cast iron and other cookware, a wood cutting board looks and works its best, and lasts longer, when it's well cared for on a regular basis!
 
Board butter acts as a physical barrier on the surface of the wood that protects against stains and liquids. The board butter also aids in sanitation as it fills and seals in knife scars and microscopic cracks. Used in conjunction, mineral oil and board butter will help keep your board sanitary, easier to clean, and avoid it from warping. 
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Using a dry cloth, rub the board butter onto your board until it's coated in a thin layer. Allow to set for 5-15 minutes, and then buff with in a circular motion until the finish is smooth.