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I have been involved in putting car dealerships together for years. We used to epoxy floors and every time there was a problem with the floor covering lifting off the concrete. The manufacturer would say it was because the installer did not prep the floor properly. Moisture would get between the two surfaces and cause bubbles. You may want to consider using tile on the floor. It costs more but we expect to get 25 years out of the floor versus the 5 years we experienced with epoxy. If you do go with epoxy please do not skip any preparation steps because you will have problems later on.