Bostik Rapid Setting Cement 10kg 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.This fast-setting cement is suitable for both interior and exterior use and can be used on brickwork, masonry, concrete, stone, flagstones, paving and paths. 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, just add water to this pre-mixed cement before mixing it in the tub provided. 1 kg will fill void of approx. 450cm³ (depending on application technique).