I personally coated our last garage with a "box store" epoxy kit. It was not a bad attempt at all. However, after saw a friend's garage that was done by Garage Experts of West Houston, I noticed how my floor resembled the definition of a non-professional project.
The owners of the company are very nice and knowledgable. The crew that conducted the work was very professional and had a high attention to detail. Normally, I would nit-pick work being done in my home, but they left me with nothing to complain about.
We are extremely happy with our new garage/showroom!