10 Best Deck Stains 2025 in the United States

Ready Seal 512 is an oil-based exterior wood stain and sealer designed for decks and other wood surfaces. One of its strongest points is its ease of application—it doesn’t require primer, thinning, or back brushing, and it blends itself smoothly without leaving streaks or runs. This makes it beginner-friendly and saves a lot of effort during application. The stain has moderate opacity, allowing about half an inch of penetration, which helps protect the wood while giving it a natural cedar color that darkens at first but settles to a natural tone within two weeks. It also offers UV resistance, which helps protect your deck from sun damage and fading over time. The product is mildew and mold resistant, which is important for outdoor use where moisture is a concern.

In terms of coverage, a 5-gallon pail covers roughly 625 square feet, suitable for larger projects. However, it is not recommended for use over painted or recently stained wood, so it works best on bare wood surfaces. While it claims to be durable, oil-based stains typically require reapplication every few years to maintain protection, so some maintenance should be expected. The flat finish will give a natural, less glossy look if you prefer that style. If you want a straightforward, reliable stain that’s easy to apply and offers good UV and mildew protection with a natural finish, this product is a solid choice. Just be aware it’s best for raw wood and not surfaces that already have paint or stain.

Ready Seal 120 Redwood is an oil-based exterior stain and sealer designed primarily for wood surfaces, making it a solid choice for deck owners looking for easy protection. Its oil base means it penetrates well into wood, helping with durability and water resistance. It offers good UV protection and is resistant to mold and mildew, which are important for keeping wood decks looking nice over time. The stain has medium opacity, providing decent color coverage without completely hiding the wood’s natural grain. The color starts darker and then settles into a true redwood shade in about two weeks.

One of its biggest strengths is the application process — it doesn’t require a primer, back brushing, or thinning, and it can be applied with a brush, roller, or sprayer without runs or streaks. This makes it beginner-friendly and saves time. It can also be applied in any temperature, which offers flexibility if you’re working around weather. However, Ready Seal cannot be applied over painted or newly stained surfaces, limiting its use on some decks without prep work.

The finish is flat, so it won’t give a shiny look, which some users may prefer or not depending on personal taste. Coverage is about 125 square feet per gallon, which is typical but not exceptional. For those seeking a stain that combines easy application with solid protection against sun and moisture, Ready Seal 120 Redwood is a suitable option. It performs best on clean, bare wood and delivers a natural, subtle appearance rather than a glossy coat.

Seal-Once Marine Ready Mix is a clear, water-based wood sealer designed especially for decks, docks, and other wood surfaces exposed to a lot of moisture. Because it’s water-based with ultra-low VOCs, it’s safer for the environment and easier to clean up than oil-based stains. Its formula penetrates deep into the wood fibers, creating a flexible and breathable barrier that helps protect against water damage, salt spray, and the sun’s UV rays. This means it helps preserve the wood's natural look rather than covering it with a thick, colored layer.

The clear finish is flat and smooth, so it won't add shine or change the wood’s appearance, which is great if you want to keep the original look. It also resists mildew and mold, which is important for wet areas like docks or porches. Because it’s clear and penetrating, it doesn't offer opacity or color options, so if you want to add color to your deck, this product isn’t suitable.

Its durability is good for high-moisture environments, but as a penetrating sealer rather than a heavy stain or paint, it may need reapplication over time to maintain protection. The two-gallon size is practical for medium to larger projects. This product is ideal for users who want an eco-friendly, effective waterproofing sealer to preserve natural wood, especially in marine or wet settings, without altering the wood’s color or providing a decorative tinted stain.