I've got a lovely oak shelf that I'd like to fit in my bathroom- it will be near the basin so will definitely get wet from time to time. Could anyone advise what I could treat it with to make it waterproof? I'd like to see the grain in the wood, so didn't particularly want to paint it. However, I had wooden worktops in a previous kitchen which were just treated with Osmo oil; whilst this helped a bit the worktops still developed watermarks over time. Surely there must be a product out there that will make it absolutely bomb proof! Any recommendations gratefully received.