Top-Cast® is a water-based, top-surface retarder which does not require covering with plastic for protection. It is available in 12 depths of etch, each one color and number coded for safety and convenience. FEATURES Comprehensive range of etch depths Color and Number coded products Requires no plastic covering Low odor USE Ideal for cast-in-place flatwork and the top surface of pre-cast concrete panels. The wide selection of grades available provides a comprehensive range of effects, from a simulated light acid wash or sand blast finish up to full exposure of 1-1/4 in. (32 mm) aggregate.