Looking for a safe, slip-resistant surface for your flat roof? Look no further than our 25 kg Granules Slate 40m2. This product is perfect for GRP flat roofs and provides a decorative, non-slip finish. The granules are added to the roofing topcoat while it is still wet, and then dusted off once the topcoat has cured. You can also roll the granules into the topcoat so that they are encapsulated, providing a safe walkway on your roof.