Yes, you should apply a thin, neat bead of 100-percent waterproof silicone caulk around the top and sides of the bathtub overflow faceplate where it meets the tiled or acrylic tub wall. This prevents splashing bathwater from seeping behind the wall surface. However, you must never caulk the bottom edge of the overflow faceplate; leaving the bottom uncaulked ensures that if any water accidentally bypasses the gasket, it can safely drain back down into the tub rather than becoming trapped behind the wall. Verification: Check that the bottom drainage gap is left open while the upper perimeter is sealed.
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