Can You Put a Sealer on Composite Decking

Henry A
Sealer on Composite Decking

Maintaining your decking is crucial if you want it to last for a very long time. One of the many maintenance treatments for decking is applying seals. Traditional wooden decks require sealing to keep them in excellent shape. But how about an ultradecking composite board? Can you put a sealer on composite decking?

Composite decking board

Sealing Composite Decking

Composites are materials made from thermoplastics and wood fibres. It looks and feels similar to wood. Many often wonder whether it’s safe to put sealers on composite decking. The short answer is yes. However, the question is, should you? There are some things you may need to consider first before using sealants and other similar products.

Before anything else, you will want to read any instruction manuals and guidelines from your board’s manufacturers. Many brands don’t recommend seals for their products. Seals won’t work on several decking board varieties, and you will only be wasting money by doing so. What’s more, many brands specifically advise against it. By doing so, can you potentially void the warranty coverage of your decking boards?

Composite decking materials have greatly improved over the years. Not only are composites more beautiful today, but they are also more resistant to issues such as moulds, mildew, and weathering. Unfortunately, that means older boards are not as high-quality as the ones being produced today. Some first-generation composites did suffer from water issues and mould growth. If you have the same problem, treating it with seals is an excellent solution.

If you have composite decking boards produced recently, you won’t likely need to seal them. But in any case, you still have the freedom to choose whether to use sealants or not. In conclusion, you can use sealers for your composite decking if your boards’ manufacturers say you can do so. It’s also an excellent way to solve water pooling and mould growth problems for older composite decking.

Can You Put a Sealer on Composite Decking

Advantages of Applying Sealers

There are many advantages to sealing a decking. Even composite decking can benefit from it. One of the best reasons to apply a sealer to your composite decking is to make it easier to maintain. With a sealed deck, you’ll spend less time cleaning it. You can also avoid several problems, such as moisture damage, mould growth, and staining. Many varieties of seals also protect the decking from fading.

Another reason to put sealer on composite decking is to brighten the colours of the decking. While it takes a while before it happens, composite decking may fade due to constant sun exposure over time. For faded composite decking, a coating of colour restoration and sealants can make them look new again.

Disadvantages of Applying Sealers

While there are more than a few reasons to put sealer on your composite decking, there are drawbacks that you should consider. As mentioned, you will void the warranty of your decking boards if your manufacturers advise against it. You could potentially waste money by doing so.

Another disadvantage of sealing composite decking is ironically the maintenance cost. While it makes the deck easier to clean, you will need to regularly re-seal the decking once you start doing it. While it may not seem like much, the added costs can add up over the years.

Should You Seal Composite Decking?

You can seal composite decking like wooden decking. However, it doesn’t always mean you need to do it. In some instances, it can be harmful to your decking. This can void the warranty or increase the maintenance cost. However, there are also several advantages. It makes composite decking easier to clean, renews older and some first-generation decking and protects them from moisture and mould. The bottom line is that you’ll need to decide whether your decking needs sealing or not.


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