Bostik Rapid Setting Cement is a cement mix with fast setting properties that help it set in as little as 20 minutes, making it ideal for emergency filling and patching repairs.The fast-setting cement is suitable for both interior and exterior use. It is ideal for the installation of sanitary fittings and drainage systems and maintenance of concrete floors, paths and steps. The waterproof formula of the repair cement means it also sets underwater, making it suitable for filling service apertures around pipes and conduits.For optimal convenience, the pre-mixed cement only requires the addition of water before mixing it in the tub provided.Suitable materials: Brickwork, masonry, concrete, stone, flagstones, paving, paths.Coverage: 1 kg will fill void of 450cm³ (depending on application technique).