World Contracting LLC we will always seal anything natural or porous prior to floating epoxy. I have also heard of floating epoxy across raw tile to give it an epoxy seal! i wonder how that will hold up, only 1 way to tell....
Here’s another thought if you’re in the planning stages of a bathroom: storage amongst the cabinets. By simply raising the countertop and slipping in four narrow slats, this homeowner instantly has useful storage space for towels.