Tread-Flex Surface & Seal is an acrylic deck coating which seals and repairs existing concrete decks, balconies, walks and rooftops. With proper preparation, crack repair and good drainage, Tread-Flex will provide a non-slip waterproof surface and long lasting protection. It can be applied over the following properly prepared surfaces: Previously painted concrete, walkways, balconies, Bitumen (new or aged), flat roofs, low slope roofs, concrete decks and various flooring. Tread-Flex can be used over properly prepared tiled surfaces, spray deck, euro-tile, concrete Chattahoochee, wood decks and docks.