Can You Seal Composite Decking

If you own composite decking, you may be wondering if it’s necessary to seal it. Composite decking is a popular choice for outdoor living spaces due to its durability and low maintenance requirements. However, like any outdoor surface, it’s exposed to the elements and can become damaged over time.

In this article, we’ll explore whether or not you can seal composite decking and what benefits sealing may offer. Sealing composite decking involves applying a protective coating to the surface of the deck, which helps to prevent moisture from penetrating into the boards. Moisture can cause composite decking to swell and warp, leading to unsightly cracks and splits.

Additionally, sealing can help protect against fading caused by UV rays from the sun. While some manufacturers recommend against sealing their products, others suggest that it can prolong the life of your deck and keep it looking great for years to come.

Let’s dive deeper into whether or not you should consider sealing your composite decking.

The Basics Of Composite Decking

Composite decking has been gaining popularity in recent years due to its durability and low maintenance requirements. It is made of a mixture of wood fibers and plastic, making it resistant to rot, insects, and weathering.

However, one question that homeowners often ask is whether or not they can seal composite decking. The short answer is no, you cannot seal composite decking. Unlike traditional wood decks, composite decking does not need to be sealed or stained to protect it from the elements.

In fact, sealing your composite deck can actually cause more harm than good. The sealing material can trap moisture inside the deck boards, leading to mold and mildew growth. So if you cannot seal your composite deck, what should you do?

The best way to care for your composite deck is to regularly clean it with soap and water or a specialized deck cleaner. You can also prevent scratches by placing furniture pads under the legs of your patio furniture. With proper care and maintenance, your composite deck will look great for years to come without the need for sealing or staining.

Understanding The Need For Sealing

Sealing your composite decking is a crucial step in ensuring its longevity and resilience. Composite decking may be durable and low-maintenance, but it still needs to be protected from moisture, UV rays, and other environmental factors. Sealing the boards will help prevent them from warping, cracking, fading, or staining over time.

Moreover, sealing your composite decking can also enhance its appearance and color retention. By adding a protective layer on top of the surface, you can make the colors more vibrant and consistent while reducing the risk of discoloration or fading. Some sealants even come with anti-slip properties that can make your deck safer and more comfortable to walk on.

Lastly, sealing your composite decking is a relatively easy and affordable task that you can do yourself or hire a professional to do for you. Most sealants are water-based or oil-based and can be applied with a brush or roller. You should apply two coats of sealant evenly across the entire deck surface and allow it to dry completely before using the deck again.

With proper maintenance and care, your sealed composite decking can last for many years without losing its beauty or functionality.

Benefits Of Sealing Composite Decking

Sealing composite decking – is it even possible?

Well, my dear reader, the answer to that question is a resounding YES! And who wouldn’t want to seal their decking? After all, who doesn’t enjoy spending hours on end scrubbing away at stubborn stains and mold growth?

But don’t worry, sealing your composite decking will give you the opportunity to do just that. But wait, there’s more!

Sealing your composite decking also has many benefits. It can help prevent water damage, UV rays from the sun, and even scratches from everyday wear and tear. Plus, it can enhance the color of your decking and make it look brand new again. Who wouldn’t want all of these benefits?

In addition to all of these benefits, sealing your composite decking is also very easy to do. All you need is a good quality sealer and a few hours of your time. And once you’re done, you’ll be able to sit back, relax and enjoy your beautiful new deck without any worries or stresses.

So go ahead and seal that deck – you won’t regret it!

Manufacturers’ Recommendations

Most composite decking manufacturers do not recommend sealing their products. This is because composite decking is designed to be low-maintenance and resistant to moisture, rot, and insects. Sealing the deck may also interfere with its ability to resist fading and staining.

If you do decide to seal your composite deck, it’s important to follow the manufacturer’s recommendations carefully. Some manufacturers may offer specific sealers that are compatible with their products.

Make sure to choose a sealer that is appropriate for your climate and intended use. It’s also important to note that sealing your composite deck may void the manufacturer’s warranty.

Before making any decisions about sealing your deck, be sure to consult the manufacturer’s guidelines and consider the potential risks and benefits.

Types Of Sealers

As the manufacturers recommend, it is essential to seal your composite decking to protect it from moisture damage and fading. But can you seal composite decking? The answer is yes! Sealing your decking will not only add a layer of protection but also enhance its natural beauty.

There are various types of sealers available in the market for composite decking, each with its own set of benefits. Here are some of the most common types of sealers:

  • Acrylic sealer: This type of sealer offers excellent water resistance and protects against mildew and algae growth.
  • Oil-based sealer: It penetrates deep into the wood fibers, providing long-lasting protection against moisture damage.
  • Polyurethane sealer: It forms a hard protective layer on top of the deck that resists scratches and stains.
  • Epoxy sealer: It provides an incredibly durable surface that is resistant to heavy foot traffic and extreme weather conditions.
  • Hybrid sealers: These are a combination of different types of sealers that provide multiple benefits, such as water resistance, UV protection, and color enhancement.

Before applying any sealer to your composite decking, make sure to follow these guidelines:

  • Clean your deck thoroughly using a composite deck cleaner.
  • Allow the deck to dry completely before applying any sealer.
  • Apply the sealer in thin coats using a brush or roller.
  • Avoid walking on the deck until the sealer has dried completely.
  • Reapply the sealer every 2-3 years or as recommended by the manufacturer.

In summary, sealing your composite decking is essential for protecting it from moisture damage and prolonging its lifespan. With various types of sealers available in the market, you can choose one that best suits your needs. Just make sure to follow proper application techniques and reapply as necessary to maintain its beauty and longevity.

How To Seal Your Composite Decking

Sealing your composite decking is a great way to protect it from the elements and extend its lifespan. It can also enhance the color and texture of the decking, making it look brand new. While composite decking is low-maintenance, it still requires some care to keep it looking its best.

Before you seal your composite decking, you should clean it thoroughly. Use a soft-bristled brush and mild soap or a composite deck cleaner to remove any dirt or stains. Rinse the decking with a hose or power washer and let it dry completely before applying the sealer.

Once your composite decking is clean and dry, you can apply a sealer designed specifically for composite materials. Follow the manufacturer’s instructions carefully, as different sealers may have varying application methods.

Generally, you’ll need to apply two coats of sealer, allowing each coat to dry completely before applying the next one.

With proper care and maintenance, your sealed composite decking will look great for years to come without needing frequent cleaning or repairs.

Maintenance Tips For Your Sealed Decking

Many homeowners wonder if they can seal their composite decking, and the answer is not a straightforward yes or no. While some manufacturers claim that their composite decking does not require sealing, others recommend regular sealing to extend its lifespan.

One theory behind the need for sealing composite decking is that it prevents moisture from penetrating the surface and causing damage. However, this theory has been debunked by some experts who argue that most composite decking is already moisture-resistant and sealing it may not provide any significant benefits.

Regardless of whether you choose to seal your composite decking or not, there are several maintenance tips you should follow to keep it looking great for years to come. Here are some key things to keep in mind:

  • Regularly sweep and clean your deck to remove debris and prevent mold growth.
  • Use gentle cleaning solutions and avoid harsh chemicals that could damage the surface.
  • Avoid dragging heavy furniture or sharp objects across your deck, as this could scratch or dent the surface.
  • If you notice any stains or discoloration on your deck, address them promptly with appropriate cleaning methods.

By following these tips, you can help protect your composite decking from wear and tear while maintaining its appearance over time.


In conclusion, sealing your composite decking is possible and offers numerous benefits. It helps to protect your deck from exposure to the elements, reduces the risk of stains and discoloration, and extends the lifespan of your decking materials. However, it is important to follow the manufacturer’s recommendations when selecting a sealer and applying it properly.

While sealing your composite decking may require some effort on your part, the payoff is well worth it in terms of maintaining a beautiful outdoor space that you can enjoy for years to come.

So why not take the time to seal your decking today? You’ll be glad you did when you’re relaxing on your perfectly preserved deck while others are dealing with unsightly stains and damage.