This vanity shelf is solid teak, sealed with a waterproof PU finish over the wood's own oils and silica — the same chemistry that put teak on ship decks and in commercial steam rooms for a century. Designers sized the eighteen-inch depth around real basins and faucets; artisans select each board, flatten it true, and hand-sand every edge before sealing, so nothing catches a wet hand.
The fear with wood in a bathroom is black spots. Those are mildew feeding on soap scum on the surface, not the teak rotting — rinse it, run the fan, and years pass with none. Wall-hung, it turns the sink wall into the warmest surface in the room, wood that never goes cold the way tile does on a January morning, and the open floor keeps a small bath calm.