Do You Need to Seal Composite Decking?

By Galen |

Decks made of wood need to be cared for often. This is very important for people who have used them before. They need to fix, paint, and seal their wood decks every other year or two. There are more and more people who want to use composite decks instead of wood decking. You might be wondering if you need to seal your wood deck.

What Does Composite Decking Mean?

We need to know what composite decking materials are before we can answer that question. Most composite decks on the market today are made from a mix of wood fibers and recycled plastic.

There are many good things about composite decking materials over standard wood decks. What’s great about composite decks is that it doesn’t need much care. Composite decking boards don’t need much care to keep looking good. The only thing that needs to be done is to clean up the deck often.

When it comes to keeping its nice look over time, composite decking doesn’t need to be sealed. If you want to, you can seal your composite wood decks. It is important to remember that if you decide to seal your composite deck, you will have to do it again and again to keep it looking great.

Why Is It a Good Idea to Seal Wood Decks?

It’s a good idea to seal a wood deck for many reasons. This method can be used to make decks more level outside. No need to clean your wood deck as often if you seal it. This will save you time. You can also avoid some of the problems that come with mold and spots this way.

Wood decks look better when they are sealed. This makes the color stand out more. For the simple reason that they are always in the sun and can fade from the weather. Different kinds of decks may fade a little over time. If you seal a faded wood deck, it can look brand new again.

Bad Things about Using a Sealer

Most companies that make composite decking materials say that decks made of composite wood don’t need to be sealed. There are some good reasons to seal composite material and some bad ones. The promise might not cover composite decking if you use a sealer on it, and it will cost more to keep up.

It does make cleaning decks outside easy. But you’ll have to seal the composite deck again and again to keep it looking good after you clean it. This will also make it take longer for you to clean the deck. On the other hand, this can increase the cost of deck maintenance.


How to Keep Composite Decks Clean?

Some people who like to do things themselves might like to take care of their decks outside. Now let’s talk about how to protect a deck made of composite material.

How Do I Clean My Composite Deck?

Before you seal your composite deck, you should thoroughly clean the deck surface. To clean your deck of any dirt, spots, or mold that may have formed over time. Otherwise, when you seal a composite deck, any dirt still on it will be “sealed” into it.

It is important to note that you should not use chlorine-based cleaners to clean composite decks. This is because chlorine bleach breaks things down and causes damage to the surface of the composite deck. That can then make the composite wood deck crack or change color. Before you use a power washer on your composite deck, you should know what to do to keep it in good shape.

How to Choose a Deck Sealer for Composite Decks?

After the composite decking has been cleaned well, the sealing process can begin. It’s very important to pick the right sealer for your wood deck. These sealants will not do the job as well as water-based sealants.

There are two main reasons why water-based sealants are better than other kinds. They do not change the colour of the composite decks like things that are based on solvents do. Second, they use resins that were made in a lab to stop bugs and mold from growing.

Power Wash Composite-Decking

Putting the sealant on

It would help if you brushed off any extra sealer while it’s still wet. To use the sealer, either roll it on or spray it on. After each use, be sure to back-brush the surface. The sealant is put on with a roller, and then it is brushed back into place right away.

If you use a spray sealer, you don’t have to do this step again. To finish, just use a roller. If you brush the finish back into the wood grain, the surface tension of the composite deck will go up. The mixture needs to be heated so that it can get bigger holes and hold more sealer.

More sealant brushed on top of the deck will make the finish last longer. Don’t forget that you shouldn’t use too much sealer either. You will have to wipe off extra sealant if you use more than the material can handle.

Is there too much sealant left over? The deck may have shiny, moving spots. The surface needs to have a little extra finish wiped off so that it looks clean. After that, wait at least one day and let it dry. It will be possible to use your composite wood decks as soon as they are dry.



In the end, whether you seal a composite deck or not depends on your personal taste and the situation. Composite decks are made to be low-maintenance and immune to water, rot, and fading. However, some people may choose to use a finish to make their deck look better in terms of color and appearance.

But it’s important to remember that you don’t need to seal a composite deck to keep it in good shape or extend its life. In fact, many makers say that sealing composite decks is not a good idea. This is because it may interfere with the natural weathering process and affect the performance of the deck material.

Before using any sealer, homeowners should carefully read and follow the manufacturer’s instructions. Also, cleaning and maintaining composite decks on a daily basis can help them look good and work well without having to be sealed. In the end, whether or not to seal a composite deck should depend on your personal taste and how often you want to do maintenance.

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Galen Content Writer
Galen is a content creator and decorator with five years of experience designing home decor. In his daily life, Galen is constantly on the lookout for the latest, great examples of house design and further optimizes his solutions. Additionally, he writes articles related to outdoor design, interior design, and architectural decorating materials to help brands build more engaging relationships with their audiences.

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