Pull-out cutting boards used to be a standard kitchen-cabinet feature. Over time, this feature became less popular and for a while they were hard to get. Today the pull-out cutting board is making a comeback, perhaps due to tighter spaces in small kitchens. The pull-out cutting board adds an additional cutting space and some manufacturers have improved the design of the boards for how to clean them. If you have an old pull-out cutting board that has been well used, it is probably ready for treating or refinishing.
Plane your cutting board on both sides. A wood plane is a machine that removes a thin layer of wood across the surface of a plank, leaving a more smooth and level surface. Remove the top layer of wood that is damaged by cuts and gouges. You want to reach a pristine wood surface.
Sand the planed cutting board. Also sand the edges of the board and round the new edge so that it is comfortable to handle. Clean the cutting board with a tack cloth.
Apply a food-grade mineral oil to the cutting board. Be generous. If the board is old and hasn't been maintained properly, then the wood will be very dry. Oiling will swell the grain and make it more sealed. Reapply oil monthly.
Wax with Clapam's Beeswax Salad Bowl Finish or any other food-grade wax designed for wood kitchen utensil use.