Decorative overlays can give almost any concrete surface, indoors or out, a complete face-lift and at a much lower cost than removal and replacement. A concrete overlay is a thin color concrete cement based products that go over existing concrete for repair or decorative reasons. Overlays can be applied as thin as a feather finish up to in most cases 3/4″ depending on the desired finish. Surface preparation and crack repair are essential for a concrete overlay to last at a lower cost.