The fundamental problem with thin coat epoxies, even when applied professionally, is that they do not have the same coefficient of expansion as concrete. In the brewery, where you often have near boiling liquid hitting the floor, the epoxy will eventually crack from the stress of expanding and contracting. This will obviously happen much faster with cold floors. Then everything mentioned above will begin. Also, as mentioned previously, they just cannot withstand dropping SS parts onto them. They chip and the whole system begins to fail.
IMHO spend the extra money and get a urethane enriched concrete topcoat.
Community Beer Co.
"Beer for the Greater Good"