Quote Originally Posted by heftysmokes View Post
Ah, ok. It's sometimes called backerboard; it's mostly used under tile as a subfloor.
Oh okay, I've never used it before. Is that the same stuff they use to back ceramic tiles for back splashes? If so, I'm not so confident that it would provide an adequate backing for gluing the pennies to in this application. I can see how it would work fairly well to put over a wooden sub floor to then place ceramic tile over but I still can't see it holding up without cracking if you were to simply glue pennies to it and then coat it with an epoxy bar top type of finish never mind just splashing it with a couple of coats of polyurethane.