MAS Epoxy medium hardener is a premier resin for filleting, laminating, and gluing. This polyamine blend intended for moderate activity and resistance to blushing, allowing for easier cleanups. The thicker formula resists sagging in vertical applications, yet still allows quick wet-outs of light to medium-weight fabrics. This medium-body resin is designed to perform as an adhesive and structural laminating foundation. The hardener mixes with thickeners and gel and sets quickly, while still allowing ample flow time for controlled application periods. A good choice when overnight sandability is more important than continuous laminating and open time. Formula will not fog up during critical clear coating applications.