Hi Greg-
The floors were painted with epoxy paint, but I also put down a rubberized mat for the sleds to drive across so the carbides would not scratch the concrete floor. I got the mat from a company called FarmTek, but I am not sure if they carry the mats any more.
My shop is heated, so the mat remains pliable and does not rip or tear. It is on it's second season and is holding up very well. No scratches in the floor either!
-John