i'm making a maple butcher block counter for on top of a dishwasher, and was wondering:
i will be sealing the top & edges with mineral oil, but would it be better to seal the underside with poly?
i was thinking that might work better for keeping moisture from the steam out.
also remember that the top & edges can get regular mainenance coats of oil, but the underside will not be accessible.

would the 2 different types of sealing create other problems?