I was going to throw out an old thick wooden cutting board when a friend chastised me for being so stupid. Using a belt sander, he polished off the edges and surface until it looked and felt new.
However, I remembered advice a long time ago about the importance of "conditioning" both cast-iron pans and wooden cutting boards. The latter with (food grade) mineral oil (is this the right kanji? 鉱物油 koubutsuyu? ) or walnut oil.
Does anyone know where I can get some? What I don't want to do is make the mistake of buying something like oil for motors or machinery and rubbing into the cutting board.