As nice as our new concrete patio is at our house the builders that put it in obviously did not know what they were doing and the water sits on top of the concrete instead of draining out to the yard. If anything, the drain off comes back to the house and it is starting to create damage. I have often liked epoxy flooring in our commercial offices and I know it can withstand commercial grade traffic but I am wondering how it would do over a covering like concrete on the outside of the house. Is it recommended for outside as well as in?