I have been making my own cutting board finish, which I like to call Cutting Board Butter, made from bee’s wax and mineral oil. This is very easy to make. You can order melting bee’s wax pellets online. Simply add them to a tin at a 50/50 ratio by weight and heat the tin. A hot plate works well for this.
Once heated, stir well until well mixed, and allow to cool. It makes a very nice paste wax.
This is applied liberally to all surfaces of the board and allowed to absorb.
Allow to sit for a day or so, and polish with a soft rag.
Reapply as necessary to maintain the finish.