SPEC MIX Scratch & Brown Fiber Reinforced Stucco features a special sand gradation used to provide excellent workability and finishing properties for the applicator. It also increases the flexural strength of the wall while reducing cracking and crazing which is common with traditional field-mixed stucco. To ensure uniformity and quality, each ingredient of the finished product is individually weighed before all the raw materials are thoroughly blended, bagged, and delivered.