I've got slate floor tiles laid in my kitchen and bathroom. They are fairly rustic, i.e. not smooth and with variation in colour, which is how I wanted them. I'd like to polish them so that they are fairly shiny - at the moment, they are quite dusty looking. What is the best way of doing this? I've sealed them already, and applied slate oil, but this seemed to soak in without really doing very much. Is it worth getting a wax polish? Can anyone recommend one? Should I hire a floor polisher as well (the sort that school caretakers use)? Any help much appreciated