A.Tile consultant Michael Byrne responds: So-called "non-slip" coatings, which work by etching the surface of the tiles, are available. Use of non-slip coatings, however, can affect the color, hue, and light-reflecting qualities of the tiles.

How you respond to this client may depend on who specified the tiles. If the tiles have a polished surface, they may not be appropriate for the intended use. If you have no responsibility regarding the selection or purchase of the tiles, you should direct your customer to a contractor who is trained in the application of non-slip coatings, which...

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