The "Tufdek" plywood primer by Ducan is a superior, nontoxic, water-based coating system that provides long lasting protection from water, sunlight and every day spills. The permanently flexible protective coating system is scientifically formulated for all weather exposures and everyday use. It provides superior performance over decks and many other surface applications. In 3 easy steps your exterior will be water proof, UV protected and slip resistant. The first step is to prime the plywood prior to apply the textured coat. It is long lasting, easy to apply, fast drying and waterproof. It comes in a 3.78 L (1 gal.) format.