Hello, I'm just about to start refurbishing my bathroom, and the new bath tub is going to go at the far end. The room is exactly 1.7m wide, so a standard bath will fit flush in the gap. As there is no space at the end for a shelf (for shower gel, bottles of shampoo, sponges etc), I was thinking of having a tiled shelf about 10cm wide along the long side of the bath, between the bath deck & the wall. This could be angled slightly so that water will drain back into the bath. My question is, is this asking for trouble, and will it eventually start to leak? Obviously, I'd make it very strong, and seal it to within an inch of its life... But being bombarded with water from the shower every day, will it stay waterproof forever?