A self-levelling epoxy resin is a type of floor system that requires little to no screed. It spreads out evenly by itself without any additional finishing necessary. However, self-levelling resin does require the proper preparation of the concrete floors on top of which they are poured. Without effective preparation, it is possible for the surface to be uneven, or have certain areas that are less durable than others - this may result in damage or cracking.