Best Sealer for Pressure-Treated Wood Deck

You’ve just finished installing your brand-new pressure-treated wood deck. It’s a beautiful addition to your outdoor living space, where you’ll host countless barbecues, enjoy serene morning coffees, and watch your kids play. But one more step before your deck is ready for all that action – sealing it.

Why, you ask? Well, sealing your deck is like putting a protective shield around it. It’s the superhero cape your deck needs to fight off the villains of weather damage and wear and tear. This article will dive into the world of deck sealers, exploring why they’re essential and how to choose the best one for your pressure-treated wood deck. So, let’s get started, shall we?

Why Seal a Pressure-Treated Wood Deck?

Picture your deck as a warrior. It’s strong, sturdy, and built to last. But even the mightiest warriors need armor to protect them from the elements. That’s where a good sealer comes in.

Protection from UV Rays

First off, let’s talk about the sun. While we love its warmth and light, its UV rays can be harsh on your deck. Over time, these rays can cause your deck to fade and even crack. But a quality sealer acts like a sunscreen for your deck, shielding it from harmful UV rays and keeping it looking fresh and vibrant.

Water Damage Prevention

Next up is water – the silent destroyer of wood. Rain, snow, or even your sprinkler can cause water to seep into your deck, leading to mold, mildew, and eventually, rot. But guess what? A sealer can help here too. It creates a water-resistant barrier, preventing water from penetrating the wood and causing damage.

Prolonging the Life of the Deck

Finally, sealing your deck simply makes it last longer. It’s like giving your deck a life-extending elixir. By protecting it from UV rays and water damage, a sealer helps maintain the structural integrity of your deck, ensuring it can stand strong for years to come.

Types of Deck Sealers

Choosing a sealer for your deck is like picking an outfit. You want something that not only protects but also enhances the natural beauty of your deck. There are three main types of sealers you can choose from: clear, tinted, and solid. Let’s take a closer look at each.

Clear Sealer

Think of clear sealer as the invisible cloak for your deck. It provides protection without changing the natural appearance of the wood. Clear sealers are great for showcasing the wood’s grain and texture. However, they offer less UV protection compared to their tinted and solid counterparts. So, if your deck is in direct sunlight most of the day, you might want to consider other options.

Tinted Sealer

Tinted sealers, or semi-transparent stains, offer the best of both worlds. They provide a hint of color that enhances the wood’s natural tones while still showing off its grain. Plus, they offer better UV protection than clear sealers. The downside? They may require more frequent reapplication to maintain their look and protection.

Solid Sealer

Solid sealers, also known as deck paints, offer the highest level of protection. They cover the wood completely, hiding its grain but offering maximum resistance against UV rays and water damage. Solid sealers are a good choice if your deck is older and has some imperfections you’d like to hide. However, they might peel over time and require more maintenance.

How to Choose the Best Sealer for Your Deck

Now that you know the types of sealers, how do you choose the right one for your deck? Here are some factors to consider:

Age of the Deck

Newer decks can benefit from clear or tinted sealers highlighting fresh, unblemished wood. Older decks with some wear and tear might be better suited for a solid sealer that can hide imperfections.


If your deck is exposed to harsh sunlight, a tinted or solid sealer with high UV protection would be a good choice. For wet climates, consider a sealer with excellent water resistance.

Desired Appearance

Your aesthetic preference matters too. Do you want to see the wood’s natural grain or a pop of color? Clear sealers are great for a natural look, tinted sealers add a bit of color while showing the grain, and solid sealers offer a wide range of color options.

Deck Usage

A durable solid sealer might be the best choice if your deck sees a lot of foot traffic or heavy furniture. For less trafficked areas, a clear or tinted sealer could suffice.

Top Sealers for Pressure-Treated Wood Decks

Choosing a deck sealer can feel like navigating a maze, with many options and features to consider. But don’t worry; we’ve got you covered. Here are three top-rated sealers that are perfect for pressure-treated wood decks:

Thompson’s WaterSeal

Thompson’s WaterSeal is a clear sealer favorite among many deck owners. It’s known for its advanced polymers that provide fade-resistant color and all-weather protection. Plus, it’s easy to apply and dries quickly. However, it might require more frequent reapplication than tinted or solid sealers.

Ready Seal 535

If you’re looking for a tinted sealer, Ready Seal 535 is a great option. It’s an oil-based semi-transparent stain and sealer in one. It enhances the natural beauty of the wood while offering excellent UV and water resistance. The downside? It might take longer to dry, and the color might vary based on the wood type.

Surebond – Security Sealant SB-190 Everseal Gray

Surebond – Security Sealant SB-190 Everseal Gray is a top choice for those who prefer a solid sealer. It offers maximum protection and durability, perfect for older decks or high-traffic areas. It’s also UV-resistant and flexible, preventing peeling and cracking. However, it covers the wood grain completely, which might not be everyone’s cup of tea.

How to Apply Deck Sealer

Now that you’ve chosen your sealer, it’s time to roll up your sleeves and get to work. Here’s a step-by-step guide on how to apply deck sealer:

  1. Preparation: Start by cleaning your deck thoroughly. Remove any dirt, mildew, or old finish. You can use a deck cleaner for this. Make sure to repair any damaged areas before you start sealing.
  2. Application: Once your deck is clean and dry, apply the sealer using a brush, roller, or sprayer. Follow the manufacturer’s instructions on the can for the best results. Remember, applying two thin coats is better than one thick one.
  3. Drying Time: Allow the sealer to dry completely before using the deck. Depending on the sealer and weather conditions, this can take anywhere from a few hours to a few days.
  4. Maintenance: Reapply the sealer as needed, based on the wear and tear and the manufacturer’s recommendations.

Maintaining Your Sealed Deck

Sealing your deck is just the first step in its care. Maintaining your sealed deck is crucial to ensure it stays in top shape for as long as possible. Here are some tips to help you do just that:

  1. Regular Cleaning: Even with a sealer, your deck needs regular cleaning. Sweep it regularly to remove leaves and debris, and give it a good wash with a mild detergent at least once a year.
  2. Prompt Repairs: If you notice any damage, like splintered wood or loose nails, address them promptly. Small issues can turn into big problems if left unattended.
  3. Reapplication of Sealer: Over time, your deck’s sealer will wear off. Keep an eye on its condition and reapply the sealer as needed. This could be every 1-3 years, depending on the type of sealer and your deck’s exposure to the elements.
  4. Furniture Care: Be mindful of your deck furniture. Heavy items can cause damage, and metal furniture can rust, leaving stains. Use furniture pads to prevent scratches and cover or store furniture during harsh weather.

Common Mistakes to Avoid When Sealing a Deck

Sealing a deck might seem straightforward, but there are common mistakes homeowners often make. Let’s shed some light on these to help you avoid them:

  1. Not Cleaning the Deck Properly: Sealing a dirty deck is like painting over a dirty wall – it just doesn’t work. Ensure your deck is clean and free of old finish, dirt, and mildew before sealing.
  2. Not Waiting for the Deck to Dry: Patience is key when sealing a deck. Applying the sealer while the deck is still wet from cleaning won’t adhere properly. Wait until the deck is completely dry before you start.
  3. Applying Sealer in Direct Sunlight: Direct sunlight can cause the sealer to dry too quickly, preventing it from penetrating the wood properly. Try to apply the sealer on a cloudy day or when your deck is in the shade.
  4. Applying Too Much Sealer: More is not always better. Applying too much sealer can result in a sticky surface and an uneven finish. Remember, applying two thin coats is better than one thick one.

Sealing Old Decks

Old decks have their charm, but they also come with unique challenges regarding sealing. They might have weathered wood, stubborn stains, or even some damage. But don’t worry, with a little extra care, you can restore and seal your old deck effectively. Here’s how:

  1. Deck Inspection: Start by inspecting your deck for any damage. Look for rot, splintered wood, or loose nails. Any damaged areas should be repaired before you start the sealing process.
  2. Deep Cleaning: Old decks often require a more thorough cleaning. A deck cleaner can help remove stubborn stains, mildew, and old sealer. You might also need a wood brightener to restore the wood’s natural color.
  3. Sanding: Sanding can help remove the weathered surface layer of the wood, making it more receptive to the sealer. Use a power sander for large areas and sandpaper for smaller spots and corners.
  4. Sealing: Choose a high-quality sealer that’s suitable for older wood. Solid sealers can be a good choice as they offer maximum protection and can hide imperfections.

Sealing New Decks

Sealing a new deck is like putting the finishing touch on a masterpiece. But timing is crucial. Here are some tips for sealing new decks:

  1. Wait for the Right Time: New pressure-treated wood often has a high moisture content. It’s recommended to wait a few weeks to a few months after installation before sealing your deck. This allows the wood to dry out and the sealer to adhere properly.
  2. Clean the Deck: Even though your deck is new, it must be cleaned before sealing. This removes any dirt, sawdust, or manufacturing oils that might prevent the sealer from adhering properly.
  3. Choose the Right Sealer: Clear or tinted sealers are often a good choice for new decks. They allow the natural beauty of the fresh wood to shine through while providing necessary protection.
  4. Apply the Sealer Properly: Follow the manufacturer’s instructions for the best results. Apply the sealer evenly and allow it to dry completely before using the deck.

Sealing Deck Cuts and Ends

When sealing your deck, it’s easy to focus on the large, flat surfaces and overlook the cuts and ends. But here’s the thing: cuts and ends are like the Achilles’ heel of your deck. They’re more vulnerable to moisture and decay because they expose the inner part of the wood. So, how do you protect them?

  1. Seal Immediately: The best time to seal cuts and ends is immediately after cutting the wood. This prevents any moisture from seeping in.
  2. Use a Specialized Sealer: Some sealers are designed for cuts and ends. These products penetrate the wood deeply, providing excellent protection.
  3. Apply Generously: When sealing cuts and ends, don’t be shy. Apply the sealer generously, ensuring it soaks into the wood.
  4. Reapply Regularly: Cuts and ends may require more frequent reapplication of sealer due to their vulnerability. Keep an eye on them and reapply the sealer as needed.

UV Protection for Your Deck

Like your skin, your deck needs protection from the sun’s harmful UV rays. Over time, UV exposure can cause your deck to fade, crack, and even warp. But don’t worry, a good sealer with UV protection can help shield your deck from the sun. Here’s how:

  1. Choose a Sealer with UV Protection: When choosing a sealer, look for one that specifically offers UV protection. This is often indicated on the product label.
  2. Apply the Sealer Properly: Follow the manufacturer’s instructions for application. Apply the sealer evenly and allow it to dry completely for the best protection.
  3. Reapply Regularly: UV protection doesn’t last forever. Depending on your climate and the amount of direct sunlight your deck gets, you might need to reapply the sealer every 1-2 years.
  4. Consider a Tinted or Solid Sealer: If your deck gets a lot of sun, consider using a tinted or solid sealer. These products offer better UV protection than clear sealers.

Waterproofing Your Deck

Water is one of the biggest enemies of your deck. It can cause rot, mold, and even structural damage. That’s where waterproofing comes in. A good waterproofing sealer creates a barrier that repels water, keeping your deck dry and protected. Here’s what you need to know:

  1. Choose a Waterproofing Sealer: Not all sealers are waterproof. Make sure to choose a product that specifically offers waterproofing protection.
  2. Apply the Sealer Correctly: Follow the manufacturer’s instructions for the best results. Ensure the deck is clean and dry before you start, and apply the sealer evenly.
  3. Reapply as Needed: Waterproofing sealers wear off over time. Depending on your climate and the amount of rain your deck is exposed to, you might need to reapply the sealer every 1-2 years.
  4. Consider Your Climate: Waterproofing your deck is especially important if you live in a rainy area. But even in drier climates, your deck can still be exposed to moisture from dew or sprinklers, so don’t skip this step.

Long-Term Deck Sealing Solutions

If you’re looking for a set-it-and-forget-it solution, long-term and permanent deck sealers might be the answer. These products protect your deck for several years or even a lifetime. But are they worth it?


  1. Less Maintenance: Long-term sealers reduce the need for frequent reapplication, saving you time and effort.
  2. Cost-Effective: While these sealers might be more expensive upfront, they can save you money in the long run by reducing maintenance costs.


  1. Difficult to Change: Once you apply a permanent sealer, changing it can be difficult and time-consuming. If you like to update your deck’s look every few years, a long-term sealer might not be the best choice.
  2. Potential for Peeling: Some long-term sealers form a film on the wood’s surface, which can peel over time. This can make your deck look less attractive and require additional maintenance.

Specialty Sealers

There’s a wide range of products on the market regarding deck sealers. But some stand out from the crowd with their unique features and benefits. One such product is the Seal-Once Marine Wood Sealer.

Designed specifically for wood exposed to harsh marine environments, this sealer offers superior protection against water, sun, and salt damage. It penetrates deeply into the wood, providing a long-lasting shield that doesn’t peel or wear off easily. Plus, it’s eco-friendly and safe for use around plants and animals.

But what sets Seal-Once Marine Wood Sealer apart is its nanotechnology. This allows the sealer to form a flexible, breathable barrier that protects the wood and allows moisture within the wood to escape, preventing decay from the inside out.

Whether you have a beachfront deck or want top-notch protection for your outdoor living space, specialty sealers like Seal-Once Marine Wood Sealer can be a great choice. They might cost a bit more, but their advanced protection can be well worth the investment.


Sealing your deck is an investment in the longevity and beauty of your outdoor living space. It protects against UV rays, water damage, and enhances the natural beauty of the wood. However, not all sealers are created equal. Consider your deck’s age, climate, and personal preferences when choosing a sealer.

Choose a clear, tinted, or specialty sealer that meets your needs. Additionally, pay special attention to the cuts and ends of your deck to ensure complete protection. With the right sealer and proper application, your deck can withstand the elements and provide a beautiful and functional outdoor space for years.