Concrete used for flooring can be damaged and require minor local repairs. In such situations concrete repair materials are used. They are often called concrete repair masses. An example of concrete repair chemicals are ultralite polymer repair preparations. These chemical agents have low viscosity and are suitable for both internal and external repair. Compounds for expansion joints are another necessary ingredient for concrete repairs. Ultralit Flex PU40 is the best choice among such products. It is one-component, medium-modulus polyurethane adhesive-sealant for multi-purpose use, which is curing by air moisture. It has excellent adhesion to most surfaces, forms flexible and durable joints. It can be used for bonding and sealing various building materials: concrete, wood, aluminum, galvanized and painted metal, plastic, glass, stone, ceramics, etc. It is resistant to water and moisture.