Does your beautiful wooden deck or fence look dull and weathered after just one season? You invest time and money into your outdoor wood projects, but harsh sun, rain, and snow work hard to break them down. Choosing the right sealant feels like a maze. Should you pick oil-based, water-based, or something else entirely? Many people end up with a product that peels, cracks, or fails to protect their wood, leading to costly repairs later.
This frustration stops today. We understand the struggle to find a sealant that truly lasts and keeps your wood looking vibrant. This guide cuts through the confusion. We will explain exactly what makes a great exterior wood sealant and how to match the perfect product to your specific wood and climate.
By reading on, you gain the power to protect your investment effectively. Learn the secrets to long-lasting wood beauty. Get ready to choose your sealant with total confidence, ensuring your exterior wood stays strong and stunning for years to come. Let’s dive into the best ways to seal your exterior wood!
Top Sealant For Exterior Wood Recommendations
- Ready to use clear sealant and waterproofer
- Perfect for new wood, pressure-treated wood, weathered wood and wood with a weathered clear or semi-transparent stain
- Durable sealant that provides waterproofing protection
- Repels water
- Provides SUNBLOCK UV protection
- MARINE SEALANT: Our liquid formula creates a UV-stable coating for protection against the elements, saltwater spray, and water damage. Marine is a great protector for outdoor furniture, thermally modified wood, and boat docks. Marine is safe for use over open water and is non-hazardous to aquatic life.
- DECK STAIN: It's water-based, ultra-low VOC, great for enhancing the extended life of your flooring, siding, and porch. The paint forms a water-resistant shield around wood fibers at the cellular level to help preserve the natural color.
- WATERPROOF WOOD SEALER: The wood used on boat docks, decks, and retaining walls near rivers, lakes, oceans, and ponds is subjected to constant moisture. We crafted a sealer, remove stain, and finish all in one, specifically for these installations.
- WOOD SEALANT: Our fast-drying protector penetrates wood below the surface, coating the wood fibers at the cellular level, which creates a long-lasting, flexible, breathable barrier. It provides a no-fuss, easy clean-up with soap and water.
- SEAL-ONCE: Our user-friendly wood sealers and stains are an effective way to protect your lumber or concrete against water damage. When you use Seal-Once, you have the satisfaction of knowing our products will not harm pets, plants, or people.
- WATERPROOFING STAIN – Bring out the beauty of your outdoors with Thompson’s WaterSeal Clear Multi-Purpose Waterproof Stain. Proven to waterproof concrete, brick, exterior wood and other exterior surfaces.
- CLEAR STAIN – This outdoor wood stain and sealer provides a clear finish. It will hide the grain, but still allow the texture to show. It provides complete protection while adding enhancing the natural color.
- FADE RESISTANT FINISH – The advanced polymers in this outdoor wood and deck stain deliver fade-resistant color so it stays looking great year-round. The coating resists UV damage, so you can apply with confidence.
- EASY TO USE – Whether you’re refinishing an existing fence or putting the finishing touches on a new patio, this concrete, brick, wood sealer is easy to apply. Clean the surface thoroughly prior to use for best results.
- THOMPSON’S – Protecting & maintaining all your exterior surfaces, can easily be simplified if you know where to start. Thompson’s WaterSeal is here to take the edge off, thanks to our one-coat products, informative how-to guides & decades of expertise.
- Ready to use clear wood sealant and waterproofer
- Perfect for new wood, pressure-treated wood, weathered wood and wood with a weathered clear or semi-transparent stain
- Durable water base sealant that provides waterproofing protection; Coverage up to 350 sq. ft. per gallon
- Repels water
- Provides SUNBLOCK UV protection
- It is easy to use
- It is highly durable
- Manufactured in United States
- Model number: 902
- CLEAR SEALANT: Our water-based sealer provides top-notch protection against wear and tear in high traffic areas. It’s odorless and ideal for use on wood siding, log homes, swing sets, outdoor furniture, wooden decks and fences, and more.
- WOOD SEALANT: Unlike many sealers that only form a topcoat, our protector penetrates below the surface to create a long-lasting, water-resistant shield around the wood.
- FLOOR SEALER APPLICATOR: Our premium gloss is ultra-low VOC and great for enhancing the extended life of your exterior flooring.
- WATERPROOF SEALER: Ditch the oil-based sealers and choose a UV-stable coating option. Our fast-drying liquid creates a flexible, breathable barrier and provides a no-fuss, easy clean-up with soap and water, as it allows the wood to grey naturally.
- SEAL-ONCE: Our user-friendly wood sealers and stains are an effective way to protect your lumber or concrete against water damage.
- WATER-REPELLENT WOOD CARE: This penetrating wood treatment is formulated to help create a hydrophobic barrier that repels water and routine surface contaminants, supporting long-term wood appearance across outdoor conditions.
- NATURAL, NO-GLOSS FINISH: Provides a clear, natural look that maintains wood’s aesthetic while allowing it to weather and age naturally over time. Ideal for those who prefer a subtle, low-sheen finish.
- CLEAR, LOW-ODOR, VOC-CONSCIOUS FORMULA: Crafted with a water-based, low-odor blend mindful of VOC levels, making it suitable for various application environments without overwhelming fumes.
- EASY APPLICATION & BROAD COVERAGE: Covers up to approximately 200 sq. ft. per gallon and is designed for a smooth, straightforward application process—whether using a sprayer, brush, or roller.
- INDOOR & OUTDOOR WOOD USE: Versatile enough for decks, fences, siding, and wood furniture in both indoor and outdoor settings, offering consistent performance across multiple project types.
- STAIN & SEALER IN ONE - Enhances wood’s natural beauty while providing durable, waterproof protection.
- NO PRIMING OR DILUTING - Easy application with no need for a primer, thinning, or back-brushing.
- UV & WEATHER RESISTANT - Protects against fading, water damage, and harsh outdoor conditions.
- SELF-BLENDING FORMULA - Ensures an even, streak-free finish with no lap marks.
- IDEAL FOR EXTERIOR WOOD - Perfect for decks, fences, siding, outdoor furniture, and more.
Choosing the Best Sealant for Your Exterior Wood
Protecting your outdoor wood is important. A good sealant keeps rain, sun, and bugs away. This guide helps you pick the right one for decks, fences, and siding. We will look at what makes a sealant great.
Key Features to Look For
Durability and Longevity
The best sealants last a long time. Look for products that promise protection for several years. A durable sealant means less work for you later. Check the label for expected lifespan, usually listed in years.
Water Resistance
Water is wood’s biggest enemy. It causes rot and cracking. High-quality sealants create a strong barrier against rain and moisture. This feature is non-negotiable for exterior wood.
UV Protection
Sunlight fades wood color and breaks down the wood fibers. Good sealants contain UV blockers. These act like sunscreen for your wood, keeping it looking new longer.
Breathability
Wood needs to breathe. If the sealant traps moisture inside, it can still cause rot. Choose a sealant that lets small amounts of water vapor escape. This keeps the wood healthy from the inside out.
Important Materials in Wood Sealants
Oil-Based vs. Water-Based
Sealants usually come in two main types. Oil-based sealants penetrate deeply into the wood. They offer excellent water resistance. However, they take longer to dry and have stronger odors. Water-based (acrylic or latex) sealants clean up easily with soap and water. They dry faster and are generally better for the environment.
Resin Types
The resin is the main ingredient that forms the protective film. Acrylic resins are very popular today. They handle UV rays well and remain flexible as the wood expands and contracts. Alkyd resins (often used in oil-based products) offer deep penetration.
Factors That Improve or Reduce Quality
Surface Preparation
Even the best sealant will fail if you apply it poorly. Always clean and dry the wood first. If the wood is old or gray, you must clean it with a wood brightener or cleaner. Poor preparation significantly reduces the sealant’s quality and lifespan.
Application Thickness
Applying too little sealant means poor protection. Applying too much sealant often results in a thick, uneven layer that peels later. Follow the manufacturer’s instructions for the correct amount to use.
Climate Considerations
If you live in an area with harsh winters or intense sun, you need a heavy-duty sealant. Some products are specially formulated for extreme weather. Using a standard sealant in a harsh climate will quickly reduce its quality.
User Experience and Use Cases
Decks and Walkways
For decks, you need a sealant that resists foot traffic and standing water. Look for products labeled as “Deck & Siding” sealants. These often include additives to resist mildew build-up where people walk.
Fences and Vertical Surfaces
Fences get hit by wind and rain from all angles. Water repellency is the most important factor here. Oil-based products often perform very well on vertical surfaces because they soak in deeply.
Ease of Use
Consider how easy the product is to apply. Water-based formulas are usually much easier for beginners. If you plan to use a sprayer, check the label to ensure the sealant is thin enough for that method.
10 Frequently Asked Questions About Exterior Wood Sealants
Q: What is the main difference between a stain and a sealant?
A: A stain adds color, but a sealant primarily focuses on protection from water and sun. Many modern products are “semi-transparent stains” which offer both color and sealing power.
Q: How often should I re-seal my exterior wood?
A: This depends on the product and the weather. Generally, decks need re-sealing every 1 to 3 years. Fences might last 3 to 5 years. If water stops beading on the surface, it is time to re-seal.
Q: Can I apply sealant when the wood is damp?
A: No. You must wait until the wood is completely dry. Applying sealant to damp wood traps moisture, which leads to peeling and wood rot underneath the coating.
Q: Do I need to strip old sealant off before applying new sealant?
A: If the old sealant is failing (peeling or cracking), yes, you should remove it. If the old sealant is just faded but still bonded well, light cleaning and sanding are usually enough.
Q: Which type of sealant is best for preventing mildew?
A: Look for sealants that contain mildewcides or fungicides. These ingredients actively fight the growth of mold and mildew, especially important in shaded, damp areas.
Q: Are oil-based sealants better than water-based ones?
A: Oil-based products often penetrate better and last longer on dense woods. Water-based products are easier to use, dry faster, and are safer for the environment.
Q: What is “penetrating sealant”?
A: A penetrating sealant soaks deep into the wood fibers instead of sitting on top like a film. This type of sealant resists peeling because it cures within the wood structure.
Q: Can I use interior wood sealant outside?
A: Never. Interior sealants lack the necessary UV blockers and mildew resistance required to handle harsh outdoor elements like rain and intense sun.
Q: How long does it take for the sealant to fully cure?
A: While most sealants are dry to the touch within a few hours, full curing—meaning maximum protection—can take anywhere from 24 hours to a week, depending on temperature and humidity.
Q: What safety gear should I wear when applying sealant?
A: Always wear gloves to avoid skin contact. If using strong oil-based products, wear safety glasses and ensure you have good ventilation, or wear a respirator mask.