Definitely use the Paraffin oil/liquid, but not that from hardware stores as already mentioned. Regardless of weather food will be on the board directly, I would use this. You never know when they might decide to serve up some cheese and crackers on that board. Best to be safe.
I usually get it from Woolworths or the chemist. It's in a small blue bottle ...
http://www2.woolworthsonline.com.au/...tockcode=30204
Enjoy!