TuffStuff® Non-Slip Slate Granules give a non-slip finish to finished flat roofs. The granules should be spread across the roof after the top coat is applied and before it cures. This allows the granules to bond to the roof. Once the roof has fully cured the excess granules should be swept away to leave a perfect finish. The granules are ideally suited to applications that will receive light foot traffic, e.g. balconies and walkways. Colour Accuracy: We have made every effort to make the colours on screen as accurate as possible. Unfortunately, we cannot guarantee an exact colour match of the on screen colour to the colours of the actual products and the colour appearing on screen should not be relied on as being such.