We acid etch and power wash the existing concrete to clean off dirt, remove loose aggregate and open the pores. Next, a hand troweled skim coat of polymer and portland cement is applied to the surface as thin as possible. This allows maximum absorption of the polymer into the existing concrete. When the polymer dries it becomes part of the existing concrete because the polymer is absorbed and dries as part of the old surface. The polymer strengthens and makes the existing concrete more dense as the new application and old surface become an integrated piece.