10 Best Waterproof Wood Sealers 2026 in the United States

The Ready Seal 512 is an oil-based exterior stain and sealer designed for wood surfaces, available in a 5-gallon pail of Natural Cedar color. One of its key strengths is the ease of application; it requires no primer, back brushing, or wet-line application, and it self-blends, making it 'goof proof.' This makes it an excellent option for DIY enthusiasts or those who might not have much experience with wood sealers. The ability to apply it using a sprayer, roller, or brush adds to its versatility.

You can also apply it in any temperature range, which is convenient for varying climates and conditions. Another advantage is that it provides UV protection, helping to preserve the color and integrity of the wood over time. It reaches its true color in about 14 days, which is relatively quick, and the flat finish gives a natural look to the wood.

However, its oil-based composition might be a drawback for those who prefer water-based products due to environmental concerns or easier cleanup. It also can't be applied over painted or newly stained surfaces, which could limit its use in some scenarios. Despite these minor drawbacks, it performs well for most users.

Thompson’s WaterSeal Transparent Waterproofing Wood Stain and Sealer is designed to protect outdoor wood surfaces like decks and fences by preventing water damage while adding a transparent chestnut brown color. It stands out for its waterproofing ability combined with a transparent finish that lets the natural wood texture show through, although it slightly mutes the wood grain. The product offers strong UV resistance, helping prevent color fading and damage from sun exposure, which is helpful for maintaining the wood’s appearance over time. It can be applied easily on both damp and dry wood, making it convenient for various weather conditions and saving time during application.

The coverage is quite good, and the stain exceeds industry waterproofing standards, which suggests reliability in protecting your wood. While the product provides a smooth, fade-resistant finish, it leans more towards a transparent stain rather than a solid paint, so if you want a completely opaque look, this might not be the best choice. This sealer is water-based, which usually means easier cleanup and less odor compared to oil-based products. It comes in a large 5-gallon pail, making it suitable for bigger projects.

This sealer is a solid option for anyone looking to protect and subtly enhance outdoor wood surfaces with a durable, waterproof, and UV-resistant finish that preserves the natural wood feel.

Ready Seal 120 Redwood Exterior Stain and Sealer is an oil-based wood sealer designed for outdoor use, providing a flat finish that enhances wood’s natural look with a rich redwood tone. It stands out for its ease of application — you can use a sprayer, roller, or brush, and it doesn’t require primer, back brushing, or thinning. This makes it very beginner-friendly and reduces the chance of streaks or uneven spots. The product is also versatile because it can be applied in any temperature, which helps if you’re working outdoors in varying climates.

The sealer offers good protection against UV rays, mold, and mildew, helping wood last longer outdoors. Its color darkens initially but settles into its true shade over about two weeks, which is helpful to know for planning your project. One gallon covers around 125 square feet, making it suitable for medium-sized projects. On the downside, it’s not meant to be applied over painted or freshly stained surfaces, so prepping is important.

Also, since it’s oil-based, drying time can be a bit longer compared to water-based sealers. The flat finish means it won’t have a shiny look, which some may prefer for a natural appearance but others might find less vibrant. Ready Seal 120 is a dependable choice for someone who wants a straightforward, reliable sealer that works well with minimal fuss, especially for outdoor wood surfaces needing UV and mildew resistance.