If it is more cost effective to go with tiles, then I might consider that instead.  The epoxy coating looks kind of cool though    but I need to know what type of maintenance is required for long lasting.

problem with re-tiling direct on top of existing tile
the height is increased, so check your water flow. will it flow out of bathroom?

This is not possible as the next room is the bedroom. I will have to increase the height of the bedroom floor tiles then if I were to make the toilet tile barrier higher.