Encore Coatings SB-1 1 gal SealBack™ Nano - Particle Clear Sealer is a low VOC clear acrylic sealer that is formulated with a proprietary blend of nano-particles. Each gallon of this remarkable product contains trillions of nano-particles that protect surfaces from the sun, rain, snow, and dirt buildup. SealBack can be used to treat soft and hardwood decking, composite decking, concrete surfaces, patios, sidewalks, and most vertical surfaces. For best results, apply one or two thin coats. Sold in 1 gallon container. Coverage: Up to 800 square feet (1 coat). Actual coverage will vary based on substrate type and condition.