, duplicate strength stain protector for holey cancel stone and grout. Tuff Duck is a penetrating which leaves the cancel finish uncontrived. It the bounds protection for cancel stones. A ace quart up to 800 feather feet. with advance, water-based fluoropolymers. Tuff Duck stone sealer by Rocklinite Labs is specially to protect against the toughest oil and water based stains. The sealer is with marble, granite, limestone, slate, terrazzo, travertine, sandstone and past holey stone surfaces.