Best Deck Sealers of 2018

Ask most people what a deck sealer is and they will have no clue. Some mistake it for a deck stain, while some have never even heard of such a thing. However, if you work in the wood industry, you might have an idea about the purpose of this finish. Just to make it clear, a deck sealer is a clear finish that penetrates into the wood, forming a transparent film on top. This film’s purpose is to lock out moisture and prevent water intrusion. If you are a beginner woodworker, then you should know that it is an important part of furniture making. Deck sealer is often seen on decks, wood sittings, fences and other wood surfaces.

If you want to choose the best deck sealer, then you have to pay attention to a few important elements:

  • Water resistant level
  • Transparency
  • UV blocking capabilities
  • Protection against water damage
  • Drying time

If you are looking to buy the best deck sealer for your woodworking projects and you want the best value for money, then you should also consider buying one that has the right capacity, so that you can cover a large surface.

There is no point in building a deck or any type of exterior furniture if you are not going to seal them. Especially if you live in a humid area, such a finish is mandatory. Besides protecting the wood, it also makes your terrace, balcony or porch look a lot better.

In case you were wondering which the best product on the market is, you should know that the perfect choice depends a lot on each person’s budget and personal preferences. However, there are some products that appear in most consumers’ preference top. In order to make your decision easier, we have selected five of the best-selling deck sealers on the market and reviewed them. Check them out below to see what the pros and cons are.


Product Size Weight Rating Price
Thompsons WaterSeal Natural Wood Protector Thompsons WaterSeal Natural Wood Protector 7.8 x 4 x 11.8 inches 9.54 pounds 4.9/5 $
ToughTimber - Waterproof Deck Sealer ToughTimber - Waterproof Deck Sealer 13.2 x 8.1 x 4 inches 9.27 pounds 4.9/5 $$
Eco Advance Wood Siloxane Eco Advance Wood Siloxane 7.5 x 4 x 12 inches 8 pounds 4.8/5 $
DEFY Deck Waterproofing Sealer DEFY Deck Waterproofing Sealer 11.8 x 7.4 x 4 inches 8.8 pounds 4.8/5 $
Chapin Sprayer For Deck Chapin Sprayer For Deck 8.4 x 8.4 x 18.9 inches 6.4 pounds 4.7/5 $$

1 Thompsons WaterSeal Natural Wood Protector

Thompsons deck seal is one of the market’s preferred products in this category. It can be used for decks, fences or furniture, as well as any other type of wood that is meant to be used outside the house. It comes in a large container that measures 7.8 x 4 x 11.8 inches and weighs 9.54 pounds. Thanks to its special formula, it imitates the natural protection of wood and it offers maximum strength even from the first coat. If you don’t necessarily want to make your deck look nicer, then at least you know that with this product, you get the perfect waterproofer. This wood protector not only keeps the water away, but it also protects against damage caused by humidity.

Another reason why most consumers love this product is that it helps maintain the wood’s natural color, as it is completely transparent. This type of coating resists mildew and UV damage such as discoloration. While other products require the wood to be cleaned and treated with other substance before use, this one is extremely simple to apply. Even more: it only requires one coat of this product for your deck to look perfect.

What’s to like?

  • It is affordable
  • It is high-quality
  • It comes in a large container
  • It can be used on any type of wood
  • It is strong
  • It protects against water damage
  • It protects against sun rays
  • It offers the wood a waterproof effect
  • It maintains the wood’s natural color
  • It is easy to apply
  • It resists mildew

What’s not to like?

  • It is quite slick

2 ToughTimber - Waterproof Deck Sealer

If you want to buy one of the top products on the market to seal your deck, then you must have a look at this product from Quest Chemicals. It is slightly pricier than your average deck sealer, but it is definitely worth the investment. This product can be used for industrial grade wood, for roofs, as well as decks. It comes in a 9-pound container, it is easy to apply and it penetrates deep in the wood, offering it just the protection it needs. Thanks to its Siloxane compound, it protects your deck and roof from mold and mildew, so you will live in a healthier home.

This product has the ability to reduce wood water by 95%, which is great, because your exterior furniture, fence, deck and any other wooden surface will resist more, regardless of the weather conditions in your area. The great thing about it is that it is oil and gas resistant, so if you accidentally drop some oil on the floor, the wood will not remain stained. Also, it has anti-freeze properties, so you don’t have to worry about winter anymore. It has a slight gloss, which makes wood look even better. However, it is totally transparent. One coat is enough for any surface, as it is thick enough. Mixing it with water as per the instructions is recommended for proper coverage.

What’s to like?

  • It comes in a sturdy container
  • It is easy to apply
  • It is high-quality
  • It is suitable for industrial grade wood
  • It can be used for decks and roofs
  • It is water repellent
  • It offers great protection
  • It prevents mold and mildew
  • It is oil and gas resistant
  • It is anti-freeze
  • It only requires one application
  • It has a slight gloss
  • It can cover up to 1000 square feet

What’s not to like?

  • It doesn’t have UV protection

3 Eco Advance Wood Siloxane

If you really need a high-quality deck sealer, but you aren’t willing to invest a lot of money in such a product, then we think we found your best option. This sealer for exterior wood from Eco Advance comes at a great price and offers a lot of benefits. Unlike other similar products, it is important to mention that this one does not contain any toxic substance. It can be used on commercial grade wood, using nothing more than a pump sprayer. Its smell is extremely light, so you will be barely able to feel it while applying it. It is also safe to apply around pets and plants, so you don’t have to worry about doing any damage to your environment.

More importantly, after applying a coat of this sealer, you only have to wait for about two hours. It dries quickly and it is breathable. If you have a wood decking, fence, shingles or siding that are made of new wood, you don’t have to worry. This product is great for this type of wood. It comes in an 8-pound container and it can cover approximately 240 square feet, which is less than what other products can cover. Still, it is a deck sealer that offers value for money and that is eco-friendly.

What’s to like?

  • It is affordable
  • It is eco friendly
  • It can be used on new wood
  • It is safe to use
  • It doesn’t contain toxic substances
  • It is low odor
  • It is safe around plants
  • It doesn’t stain
  • It is waterproof
  • It is safe to walk on it two hours after applying
  • It is breathable

What’s not to like?

  • It can only cover about 240 square feet

4 DEFY Deck Waterproofing Sealer

Defy brings to the market yet another high-quality deck sealer, in a 1-gallon bottle that is enough to cover your entire deck. This product is fairly priced and it has great properties. It is a water-based sealer, that is also environmentally-friendly and that helps you obtain great results. The specification that is most worthy of mentioning is that it protects the wood from the harmful effects of the sun. Equally important is that it includes zinc nano-particle technology. This means that it contains extremely tiny zinc particles that are dispersed on the entire surface in order to reflect UV rays, as well as to prevent color loss.

Although it is a water based product, it is incredibly durable and protects the wood from darkening and fading. It is also mildew and mold resistant. Applying it is really easy. You can simply use a brush or a sprayer, depending on your preferences. It dries quickly and it can be used on almost all kinds of natural wood that you are planning to use outside. This eco-friendly product is crystal clear, so you don’t have to worry about giving your wooden surface a different shade.

What’s to like?

  • It is affordable
  • It is water based
  • It is eco-friendly
  • It is a great waterproofer
  • It is crystal clear
  • It is UV resistant
  • It is mold and mildew resistant
  • It is durable
  • It is easy to apply
  • It prevents fading and darkening of the wood
  • It comes in a 1-gallon bottle
  • It uses zinc nano particle technology
  • It gives the wood a natural look

What’s not to like?

  • It isn’t that thick

5 Chapin Sprayer For Deck

Here’s a product that you will like regardless of your preferences for deck sealers. Chapin International brings to the market one of the most practical sprayers, to help you apply any deck sealer in a modern, efficient and quick way. If brushing is what you like to do, that is perfectly fine, but the entire task becomes more pleasant when using one of these 2-gallon sprayers. This product comes at a reasonable price, it has a medium capacity and it is durable. It is basically a tri-poxi tank that is compatible with deck cleaners, sealers and even with deck stains. It features a 4-inch wide funnel that can be used to clean and easily fill the tank.

This product’s fan has three modes that allow you to adjust the way you apply the deck sealer. When using this product, you can apply it using a fine, medium and coarse pattern. It is lightweight, safe to use and has a reinforced hose that will not let you down. Its handle is ergonomic, so you can use it comfortably to spray the deck. When not using it, it will be easy to clean and store, as it only measures 8.4 x 8.4 x 18.9 inches. It weighs 6.4 pounds, which is quite reasonable. The great thing about it is that it comes empty and you can fill it will your favorite product. Its only downside is that it doesn’t work with non-transparent stains, as they are too thick.

What’s to like?

  • It is affordable
  • It is a great sprayer
  • It has a 2-gallon capacity
  • It is ideal for deck sealers, cleaners and transparent stains
  • It is easy to use
  • It is lightweight
  • It can spray using 3 different patterns
  • It has an ergonomic handle
  • It comes empty
  • It has a 4-inch wide funnel
  • It is easy to fill
  • It is easy to clean
  • It is small-sized, so it can be stored anywhere

What’s not to like?

  • It cannot be used with non-transparent stain

Buying deck sealer shouldn’t be so difficult, but with so many options on every market’s shelves, it becomes harder and harder to tell the difference between a high-quality and a low-quality product. If you want to seal your deck or any other exterior wood piece, you should first make sure that what you are buying is deck sealer and not stain. The difference is that deck stain is not transparent, but adds a bit of color or matte shade to the wood. Differentiating it from deck paint will be a lot easier, but make sure you read the label carefully, just in case. Sometimes, they look very similar, but the results you will get will be completely different.

The five products above are some of the most popular choices of woodworkers, giving their prices, quantity, quality of the seal and results after applying. Analyze each product to see what are the pros and cons before making a decision.

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