Thank you everyone for the kind words!
mspecperfomance, To be honest, I was surprised we got it done in one day but we started promptly at 8 and finished at 4:50 so it turned out perfect!
The floor coating I used was Rustoleum Epoxy-Shield Professional Series in silver grey semi-gloss (they also have garage series made for less vehicle traffic)
We also used their crack filler to fill any dips and cracks in the concrete, let that dry for 8 hours. Then we rented a floor sander, sanded the entire floor (mainly to remove and old stains that would affect adhesion) washed it, acid washed it, squeegeed it all out, let it dry and applied it. It was really easy to use but I guess the real test will be starting tomorrow.
ncautoshop, your shop looks fantastic as well!