Is there a recommended product to accomplish this and not present a safety hazard during wet conditions?
Check with the manufacturer, as most do not recommend applying finish to their products. On the matter of slippage, a finished tile should not be more of a hazard than an unfinished one.
However, add enough moisture from ice and snow, and even bare concrete can become slick. For safety, it is a good ... — Lynn E. Krafft
, ICAN/ATEX editor