Rockite Fast Setting Hydraulic Cement, 1 lb. Box expands as it sets, ensuring a secure hold that comes loose or shrinks. This fast-setting cement mixes easily with water and is applied cold, setting stronger than concrete in just one hour. It is i for a variety of interior and exterior DIY projects, including anchoring bolts, screws, and railings. for patching concrete and brick, it also works well for feathering light cracks and gaps. The cement dries to an off-white finish and is conveniently packed in plastic bags within a carton for easy use. Model Number: