I'm putting a lot of wood trim and panelling in my bathroom. I laid down a coat of floor-finishing polyurethane on a lot of the trim pieces so far, then I'll sand, recoat, sand, recoat, install, recoat. The panelling itself will only get two or three coats, laid on after I install it. I think if I precoat it, I won't be able to fit it together tongue and groove. The wood is going around the wall behind the sink and the toilet. I'm sure it will get the occasional splash that doesn't get wiped off, but it will also be getting daily humidity from the shower. Will that be enough to waterproof it? Also, sometimes when I'm in restaraunts or just wherever, I see these wood tables that have like a 1/8" thick layer of clear coat or something on them that looks just awesome and polished. How can I get that?? Is that just like dozens and dozens of layers of poly, or some kind of lacquer or something??