Titebond UA 920 is a urethane acrylic elastomeric formula that does it all. It has excellent adhesion and flexibility, making it the professional's ideal choice for all interior and exterior construction, home remodeling and repair projects. It is mildew resistant, non-yellowing and reduces dirt pickup.UA 920 forms an airtight, water resistant seal on most common building materials, including concrete, fiber cement, metal, wood and vinyl siding and trim. It offers a quick grab, is easy to tool and finish and remains permanently flexible.