If it does not work and the stone doesn't stick, just lap the glue off and use this:

http://www.homedepot.com/p/Loctite-0...k#.UYBkFivSPxY

This is what I use, and to answer your question, I use granit/marble floor tile. I usually get HD or Lowes to cut it for me, then I take a 60 sanding screen to rough it up, wash/dry it then hit it with the epoxy.


Hope this helps....Although far too late

Regards,
Chris