But the instructions clearly state, "Apply one coat only." Let dry 24 hours. The second coat can go on a little lighter than the first coat, and will ensure good coverage and adequate penetration into the wood for weather protection. Many parts of the deck are still tacky. Do not sand sealer coat before applying coat 2. Seal or Stain the Deck Boards . Strip off any old stain that may be on the wood. Usually no more than one coat is needed. Coat 3 — Thin 10%. Pick the finish that you want and apply accordingly. Coat 1 — Thin about 50% with the specified thinner. Clean with a deck cleaner and sand the surface to remove any loose wood fibres and contamination; ensure that the new coating soaks in evenly. This is the sealer coat. How many coats are required? Even if you decide not to stain your deck, you should always apply some kind of sealer to keep it protected from the elements. A major source of problems for deck finishes is the over-application of the coating. If the droplets sink in, the wood is ready to be stained. Deck Defense is designed as a one-coat stain, although due to the deep penetrating properties of the product, it may appear lighter than expected. To avoid “lap marks” make sure that the leading edge is kept wet and that wet stain is brushed into wet stain. Many homeowners and even some professional paint contractors incorrectly believe “more is better.” In order for an oil-based stain to be effective, it must be able to penetrate the wood’s surface. HOW MANY COATS OF STAIN SHOULD I APPLY? Before applying stain, make sure your deck has been cleaned properly. On new decks, apply only one coat of oil-based deck finishes. Stain the pressure-treated wood using a paint pad applicator, which is easier than brushing a large deck or structure by hand and more accurate than using a pressurized sprayer. Expect the butted ends of lumber to accept more stain. Let dry 24 hours. Apply the finish to 10 to 15 square feet of boards at a time, then … Use a paintbrush to stain between cracks and problem areas. Allow to dry overnight. If available, you may also use a roller to first apply the stain, then work it into the wood with your brush. Otherwise, you risk having your deck rot out within the first couple of years. That depends upon what type of stain you are using. There are several techniques you can use to apply a deck sealer. When in doubt, follow the instructions written on the container. A protective polyurethane topcoat is a great way to seal your wooden deck and increase its longevity. Coat 4 — Sand coat 3 lightly with 220-grit paper. Sprinkle some water on the deck. Step 8 Wipe the deck with a dry towel after the second coat, cleaning up any puddles. This is especially true on older surfaces that have been exposed for long periods of time. He applied two coats of (a brand of) clear sealer. Applying the sealer with a brush gives you the greatest control for the most even application and will ensure that you get the sealer not only on the deck boards but in … Are More Coats Better? Apply sealer or stain to the deck boards, using the same techniques used on the railings and your choice of applicator: paint pad, paint roller, paintbrush, or garden sprayer. Working with the wood grain, apply an even coat of stain using a 4-inch brush. For composite decking—that’s decking made from recycled plastic materials and wood—follow the manufacturer’s recommendations. Apply over coat 2 without sanding. A one-coat application is recommended. Coat 2 — Thin 20% with specified thinner. If project requires more than 1 container, blend all containers together to ensure uniformity. DO NOT APPLY 2 COATS. SEAL-ONCE® MARINE Premium Waterproofing Wood Sealer & Stain is designed to protect & stabilize marine wood against water damage, salt water spray & decay. 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