Always nice to see an update especially over that elapsed time for your epoxy. Do you remember what kind of prep you did on your cement floor prior to putting down the epoxy? Did you do a clear on top as well?
I shotblasted it followed by acid etching. It was really rough and clean when I put down the epoxy-coat. But it was early spring and I had several bubbles in the first coat. The 2nd coat smoothed out almost all of the bubbles - I got a touch up kit from epoxy coat and fixed the few that were left after the 2nd coat.
Then I screwed up - I put down a clear coat (not epoxy-coat). i now have tire marks wherever a vehicle has been sitting. I'm thinking about sanding off the clear coat and reapplying a new clear coat.
But the epoxy itself is extremely durable. I drag stuff across it all the time - maybe scratches the clear coat but doesn't hurt the epoxy.