10 Best Deck Sealers 2025 in the United States

The Ready Seal 545 Exterior Stain and Sealer is an oil-based product designed for wood surfaces, available in a 5-gallon container with a Burnt Hickory finish. Its ease of application is a key strength, requiring no primer or back brushing. It can be applied using a sprayer, roller, or brush without causing runs, laps, or streaks, making it user-friendly for those with little experience in applying sealers.

The product does not require diluting or thinning prior to application, saving time and effort. It is designed to blend itself without needing a wet-line application and can be applied under any temperature conditions, adding to its flexibility and convenience. This sealer is also noted for its coverage and the natural finish it provides over wood surfaces.

It takes approximately 14 days to reach its true color, so some patience is required. It's important not to apply it over painted or newly stained surfaces, as sealed surfaces will inhibit penetration. The product has good customer reviews, with a 4.5 out of 5-star rating, indicating general satisfaction among users. Those looking for a straightforward, easy-to-apply deck sealer that provides a natural look to wood surfaces may find this product suitable.

DEFY Extreme Crystal Clear is a water-based, clear wood sealer designed to protect outdoor wood surfaces like decks, fences, and siding. It is notable for its strong waterproofing ability, which helps prevent moisture damage—a key factor for maintaining wood outdoors. This sealer uses zinc nanoparticles to block UV rays, helping stop sun damage that often causes wood to gray and degrade over time. Users appreciate that it maintains the natural look of the wood without adding color or hiding the grain.

The product offers durability suitable for extending the life of wood surfaces in various weather conditions. Application is user-friendly: it can be applied with a sprayer, brush, or roller, and cleanup requires only soap and water. Coverage is typical, about 100-150 square feet per gallon for two coats. Water-based sealers generally dry faster than oil-based ones, allowing quicker project completion.

Since it is clear and matte, it does not add any color or deepen the wood tone like some tinted stains, which may be a consideration for aesthetic preferences. Additionally, the 5-gallon pail weighs 45 pounds, which can make handling more challenging. This sealer is ideal for homeowners seeking a transparent, durable, and easy-to-apply product to protect outdoor wood from water and sun damage while preserving its natural appearance.

Ready Seal 515 is an oil-based wood stain and sealer designed for exterior wood surfaces, making it a strong candidate for protecting decks. One of its biggest advantages is its easy, 'goof-proof' application — you can use a sprayer, roller, or brush without worrying about runs, streaks, or the need for back brushing. It also doesn't require thinning or special temperature conditions, which simplifies the staining process for non-professionals.

The sealer provides good protection with UV resistance and mildew and mold resistance, helping your deck withstand sun damage and moisture issues over time. It is water-resistant and rainproof, adding durability to the wood against weather elements. The stain reaches its true color around two weeks after application, starting darker initially, which is helpful to know for aesthetics. Coverage is solid, approximately 625 square feet per 5-gallon pail, making it cost-effective for larger projects.

It is important to apply it only on bare wood—not over painted or freshly stained surfaces—as it seals the wood tightly and doesn't allow penetration afterward. The finish is flat, which some may prefer for a natural look but might not suit those wanting a shinier appearance. The product’s no-back-brushing and self-blending nature contribute to a smooth drying process. Ready Seal 515 offers strong protection and ease of use, especially suited for homeowners looking to maintain the natural color and durability of their wood decks with minimal hassle.