10 Best Waterproof Deck Sealers 2025 in the United States

The Ready Seal 512 5-Gallon Pail Natural Cedar Exterior Stain and Sealer for Wood offers a number of appealing features for anyone looking to protect their outdoor wood surfaces. This oil-based product requires no primer and can be applied using a sprayer, roller, or brush, making it quite versatile and user-friendly. One of its standout characteristics is the 'Goof Proof' application – it does not require back brushing, and it blends itself to avoid any laps, runs, or streaks, even when applied in varying temperatures. This makes it particularly easy to apply, even for those with little to no experience in staining and sealing wood. Additionally, it does not need diluting or thinning prior to spray application, further simplifying the process.

From a performance perspective, the Ready Seal 512 provides good water resistance and is UV resistant, helping preserve the wood's natural appearance and protect it from weathering and sun damage. The fact that it reaches its true color in about 14 days can be a minor inconvenience for those seeking immediate results. On the durability front, it is reliable and long-lasting, making it suitable for exterior use on various wood surfaces like decks and fences. However, the product should not be applied over painted or recently stained surfaces, as sealed surfaces inhibit penetration. Another consideration is its environmental impact; as an oil-based product, it may not be the most eco-friendly option available. Some states also include a PaintCare recycling fee, which is an additional cost.

With its ease of application and effective protection, this stain and sealer is a strong contender for anyone needing to maintain their wooden outdoor structures.

The SEAL-ONCE Marine Ready Mix is a water-based, penetrating wood sealer designed specifically for high-moisture outdoor areas such as docks, decks, and piers. Its liquid formula provides strong water resistance by creating a barrier that protects wood at the cellular level, helping prevent water damage and preserve the wood's natural color. It also offers UV protection through a stable coating that guards against sun damage and saltwater spray, making it suitable for marine environments.

One of its standout features is being eco-friendly, with an ultra-low VOC content that is safe for aquatic life and pets, which is great for environmentally conscious users. The sealer dries quickly and is easy to clean up with soap and water, making application straightforward even for those without much experience. Additionally, it forms a flexible, breathable layer that supports long-lasting durability without cracking or peeling.

While this product is excellent for wood and outdoor use near water, it is specifically made for wood only and will not work on other materials. Being a penetrating sealer, it may require reapplication over time to maintain protection, especially in very harsh conditions. This product is suitable for anyone needing a reliable, non-toxic wood sealer for decks or docks exposed to water and sunlight, combining strong performance with ease of use and environmental care.

Thompson’s WaterSeal Multi-Surface Waterproofer Stain is a versatile product designed to protect various exterior surfaces such as wood, concrete, and brick. One of its notable strengths is its clear finish, which enhances the natural color of the material without hiding its texture. The advanced polymers in this stain ensure that the color remains fade-resistant and protected against UV damage, making it a reliable choice for long-lasting outdoor use.

Additionally, its ease of application is a significant advantage, whether you are working on an existing structure or a new project. The product’s one-coat application further underscores its user-friendly nature and effectiveness. However, while the product is effective in waterproofing and providing UV protection, its clear finish might not be ideal for those looking for a colored stain.

Also, the environmental impact is not explicitly mentioned, which might be a concern for eco-conscious users. Despite these minor drawbacks, Thompson’s WaterSeal Multi-Surface Waterproofer Stain offers robust protection and an easy application process, making it an excellent choice for anyone looking to maintain and enhance the beauty of their outdoor spaces.