I use mineral oil and after than I rub in bees wax I get from a local beekeeper. It seems to make the luster last and it smells great. Every once in a while I re-apply the oil and rub in more wax. For the few boards I have made I give a small bar of wax with the board. BTW, they are end grain boards. I can't believe the amount of long grain boards I see people buy. It makes me sad.