This walnut and mahogany glue up spent a long while soaking in a bath of pure mineral oil before it was finished and installed in an essential oils box that was made recently. The mineral oil will make sure that the wood is protected as well as food safe in case any of the oil bottles stored inside it would spill. Certain stains or poly coatings would react and discolor but mineral oil will let the wood remain in great condition for years to come.