SL-1 is a high-performance quick-setting self-leveling underlayment. It is used to level floors prior to the installation of ceramic tile, natural stone, resilient flooring, carpet, wood, and other floor coverings. It is a high compressive strength underlayment and it can be applied from feather-edge to 2" (50 mm) thick in a single pour. It is a self-leveling and self-drying underlayment and repair mix for interior concrete and engineer-approved floors. It offers high compressive strength, is abrasion-resistant, and has a long heal time. Lightfoot traffic can begin after 2 to 3 hours and vehicular rubber-wheel traffic after 3 days.