The company’s Scratch and Brown Coat Stucco is a dry, preblended stucco that is computer batched for consistency and performance unmatched by traditional field-mixed stucco. The material is designed to fully comply with ASTM C 926. SPEC MIX Stucco products utilize a custom-blended sand gradation that increases the wall’s flexural strength while it reduces cracking and crazing. This sand gradation also provides excellent workability and finishing properties, every time.