Mechanical, which consists of grinding, blasting or sanding the coating off the surface; Ad find deals on products in power tools on amazon. Pin on Food You may need to remove the old cement sealer before applying the new one. How to remove concrete sealer from stamped concrete . Application of the product is as follows: The easiest way to remove a concrete sealer is to begin by acid etching the surface of the concrete with muriatic acid. How to remove a concrete sealer: In this case, the xylene would have been better applied by flooding it. Must be done by a professional otherwise it will damage the stamped surface. How to remove sealer that is flaking off stamped concrete 2003. The removal of old concrete sealer can be done in one of two ways: If the concrete is not tacky or sticky the concrete was sealed with a water based sealer. It needs to be free of any contaminants such as spilled oil, grease, dirt, paint, or waxes before you seal the area. Turn o...