We use Danish Oil, a traditional oil which is perfect for bringing out the natural grain of the wood whilst leaving a durable, satin finish. If unsure, please do order a sample of each. This is due to the the machine sanding process removing more of the dark outer part of the board, and also because it closes the grain more which means less oil is absorbed. Please be aware that machine sanded boards, when oiled, will often finish a lighter shade than an equivalent hand sanded board. This makes it more suitable for furniture making. Full (machine) sand: The board is drum sanded, which takes out any un-evenness and makes the board more uniform in appearance and thickness. This takes out any lumps and bumps and leaves the board smoother than when it is unfinished. Light (hand) sand: We give the board a light sand by hand.