I use black rubber mat from Home Depot. The kind that comes on the cut to length roll. I got a cut the length of my car bay, rolled it up and cut it in half with a circular saw to get 2 lengths. I think it was like $40.
If you go the epoxy route you can protect it during the winter months with pieces of our Www.supratile.com. We would have this in our overstock at 50% off to make lanes to protect the floor, and is easily removed and stacked up when not in use.