Diamond Grinding – Epoxy and other concrete garage floor coatings need to achieve a good mechanical bond to the concrete. The problem with a concrete garage floor is that they are finished with a wet-float technique to leave them nice and smooth, minimizing the porosity of the concrete. Without the proper mechanical bond, the epoxy coating will fail. To get the proper mechanical bond, the concrete garage floor needs to be profiled, or textured, to the equivalent of 60 to 120 grit sandpaper. This is best achieved by grinding the concrete garage floor using diamond blocks.  …more on Grinding vs Acid Etch for Concrete Garage Floor