X-100 Natural Seal Deck Stain X-100 Natural Seal Deck Stain is the terrific all-around wood deck protection product. Not only will X-100 Natural Seal Deck Stain enhance the color and texture of your wood deck, but its transparent technology will allow the wood grain to show through, providing a natural-looking finish. X-100 Natural Seal Deck Stain is a terrific product for new and old decks, from those made from pressure-treated lumber to those made from hardwood decking lumber such as redwood or cedar. Because of its penetrating formula, X-100 Natural Seal Deck Stain is recommended even for decks whose surfaces have weathered, opening the grain. X-100 Natural Seal Deck Stain is available in ultra-transparent and many semi-transparent tinted formulas.