Formulated to break down sealers on concrete and masonry surfaces, the Lifeguard Sealer Remover is biodegradable, fast-acting, and easy to use. The heavy-duty stripper removes urethanes, acrylics, epoxies, polyurethanes, and lacquers. It does not contain MEK or methylene chloride. Lifeguard Waterproofing Products Inc., 800-213-7308.