Surecrete 25103002 Gray MicroTek (Micro Topping) One Coat Micro Topping is a thin concrete overlay mix that can be applied on floors and walls. Available in a white or gray mix, our thin overlay can be colored with any of our 30 standard overlay colors. Micro-Topping was designed to yield an exceptionally smooth tight-troweled finish that can provide a new “blank canvas” for decorative concrete floors. It may also be placed vertically on interior walls, creating the look of Venetian plaster.