The red devil pre-mixed concrete patch is a ready-to-use concrete patch that repairs holes, cracks, breaks, and other imperfections in concrete or masonry surfaces without shrinking or cracking. It is not recommended for areas subject to vehicular traffic. Features: repairs cracks and breaks in concrete interior exterior use maximum flexibility paintable won't shrink or crack water clean up dries a concrete color packaging: 1 gallon pail adheres to: concrete use on: concrete masonry brick block