Aww that's adorable!
I don't know if it's the same as what Hunter was talking about but they do make a marine grade poly which we have used on wood counter tops that my husband made. It's pretty expensive though and we could only find it in a quart size. It's really nice but I would never be able to afford to coat my whole barn in it.
Do I get a prize for making the first post on page 1,000????