Concrete overlay systems have been used around the world for decades.  Initially used in the resurfacing of roads, bridges and airports this extremely durable technology made its way into the decorative concrete arena over the last two decades.  Overlays can come in many different forms depending on the nature of the application but most are cement based coatings that are modified using high quality polymers.  This creates very hard, dense surface with incredible bond strength in more finishes and looks than you can imagine.