High Performance Cement FastSet™ Stucco Mix is a fast setting polymer modified, fiber reinforced, Portland cement-based stucco designed for use as the scratch and/or brown coat in a 3-coat stucco application, or the first coat in a 2-coat application. FastSet™ Stucco Mix has a working time of 30 minutes and is formulated to provide crack resistance, minimal shrinkage, high compressive strengths, water repellency and improved durability. Use as directed.