I didn't acid etch, however since others are sharing what they did, I'll jump on the same band wagon. I used Garage Solutions (
Garage Cabinets, Garage Storage, Garage Organization, Garage Floors. San Francisco, Bay Area, San Jose, San Rafael. The most complete garage improvement company. Garage Solutions. Calm. Cool. Very Collected.) for epoxy floors and cabinets. It's been less than a year, however the floor is holding up great. Easy to mop up the dirty drips from wet cars, easy to wipe up
oil drips with a paper towel, and easy to either sweep or vacuum when dry. They ground the floor surface before applying the epoxy coatings.