Tower Expansion Joint & Vertical Sealant is designed to repair large or small vertical control or expansion joints. This is a single component, non-sag, water-based acrylic product is for use in vertical applications, such as concrete walls, brick walls, stucco walls, cement fiber board, concrete block and other masonry surfaces. Combines Tower's durability, flexibility and adhesion for lasting control joints and vertical crack repairs. Primeless application makes it easy-to-apply, 100% acrylic urethane acrylic based product is designed for many types of vertical joints. The cured material is mildew and UV resistant, can be painted and exceeds the performance requirements of ASTM C-920.