Boiled linseed oil followed by beeswax.
If you don't have any beeswax, I think it's worth having some around. It's cheap. I use for all kinds of things, including making lip balm for the winter season. It's one of the bees' "miracle products." For some reason, the stuff they make (honey, wax, royal jelly, etc.) all seems to have some amazing properties. Interesting.