Sucrete Suretex® 25101010 White Winter Concrete Knockdown Overlay Mix . SureTex™ is a concrete knockdown overlay that has larger slightly larger aggregate than other overlays to help creates deeper textures and designs. SureTex is specially formulated for quicker dry time and can be applied with a trowel or sprayed with a hopper gun. This overlay is easy to mix, just add water and one of SureCrete’s standard 30 overlay colors.