10 Best Cedar Deck Sealers 2025 in the United States

The Ready Seal 512 5-Gallon Pail Natural Cedar Exterior Stain and Sealer is an oil-based product designed specifically for wood surfaces. It stands out for its easy application process, requiring no primer, back brushing, or special temperature conditions for proper application. This 'goof-proof' application is ideal for users who may not have extensive experience with sealing decks, as it prevents laps, runs, and streaks.

Additionally, it can be applied using a sprayer, roller, or brush, adding to its versatility. The product offers strong UV resistance, which helps in protecting the wood from sun damage, enhancing the longevity of the finish. Water resistance is another key feature, providing a robust barrier against moisture, which can be critical for maintaining the integrity of a cedar deck.

However, it's worth noting that the true color of the sealer only becomes apparent approximately 14 days after application, which may require some patience. The sealer also cannot be applied over painted or newly stained surfaces, as they inhibit penetration. This may limit its use for some projects. This sealer is especially suitable for those seeking an easy-to-apply, UV and water-resistant product for cedar decks, provided they can accommodate its specific application requirements.

The SEAL-ONCE Marine Ready Mix is a water-based, polyurethane sealer designed specifically for wood exposed to high moisture, such as docks, decks, and piers. It offers solid UV protection by forming a UV-stable coating that helps prevent sun damage and fading, which is important for cedar decks exposed to sunlight. Its water resistance is strong thanks to a penetrating formula that waterproofs wood fibers below the surface, making it well suited to handle constant moisture and saltwater exposure. This also adds mildew and mold resistance, since the sealer blocks moisture that can cause fungal growth.

The product is easy to apply with a fast-drying, low-VOC formula that cleans up with soap and water, making it safer for pets, plants, and people around your deck area. Durability-wise, it creates a flexible, breathable barrier that lasts, reducing the need for frequent reapplications. This sealer carries a satin finish, which enhances the natural look of cedar but may not offer as glossy a look as some other options. While it is highly effective for wood exposed to marine conditions, it may be somewhat specialized for those seeking to seal a backyard cedar deck without extreme moisture concerns.

This product represents a strong choice for those wanting a reliable, environmentally friendly sealer that excels in protecting wood in wet environments and maintaining the appearance of cedar decks over time.

The Olympic Maximum Cedar Transparent Exterior Stain and Sealant in One is designed for exterior wood surfaces, making it suitable for decks, fences, siding, and more. Its weather-ready application allows for use in temperatures as low as 35°F, and it is rain-ready in 8 hours, which is convenient for fluctuating weather conditions.

The product combines a wood stain and sealant, saving time and effort by providing both color and protection in one step. Its transparent finish highlights the natural wood grain while adding a cedar hue. The advanced SunBlock UV defense helps protect wood from sun damage, while the SCUFF GUARD technology and enhanced waterproofing provide durability and resistance to wear and water damage. Additionally, the formula offers mildew and mold resistance, crucial for outdoor wood maintenance.

Application is straightforward, and it can be used on various wood conditions, including new, dry, pressure-treated, and weathered wood. At 45.4 pounds, the 5-gallon pail is quite heavy, which might make handling and application more challenging for some users. The product is noted for its low VOC content, making it a more environmentally friendly option. The product's coverage is up to 2000 sq. ft., which is quite generous. Some users might find the need for reapplication within two years a bit frequent, though this is somewhat typical for exterior wood treatments. This product is best suited for homeowners or DIY enthusiasts looking to protect and enhance their wood surfaces with a reliable, all-in-one solution.