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.

Seal-Once Marine Premium Wood Sealer is a versatile product ideal for protecting cedar decks and other wooden structures exposed to moisture. One of its strongest attributes is its multi-functional nature, serving as both a wood stain and sealer. This can save users time and effort, as they won't need to apply multiple products. The sealer offers UV protection, which is crucial for preventing damage from sunlight and helps maintain the wood's natural color. It is also water-resistant, making it suitable for areas near water bodies like boat docks or decks that face high moisture levels.

The formula is designed to penetrate the wood deeply, creating a durable barrier that extends the life of the wood. Additionally, it is safe for use near aquatic life, which is a significant ecological advantage. However, while it boasts of being easy to apply and clean up with soap and water, some users might find the one-gallon container insufficient for larger projects. It might require multiple purchases to cover extensive areas, potentially increasing the cost. Furthermore, its water-based formula, while low in VOCs and environmentally friendly, may not provide the same level of long-term protection as some oil-based alternatives.

For those prioritizing eco-friendliness and ease of use, this product is a solid choice, but those seeking maximum durability might need to weigh their options carefully.

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.