Best Basement Wall Sealer Reviews In 2020: Our Top 5 Picks

Basements are an integral part of a house, and they are useful in many ways. From acting as a storage unit to being used as a shelter zone, they really come in handy.

However, their walls are prone to damage, usually by cracking, fungi, moisture, and mold. If you are reading this, no doubt you are facing wall troubles, and hence searching for a good sealer to fix the wall for good.

Most companies provide second-tier sealers that wear off frequently, undoing your hard work. That’s where we come in. Our reviews of the best basement wall sealer will ensure you spend the least for the best.

Hence, worry no longer, and check out our top sealers listed only for you!

5 Best Basement Wall Sealer: Our Review

Preview
Best Overall
Liquid Rubber Foundation and Basement Sealant - Indoor & Outdoor Use - Easy to Apply - Waterproof Coating - Black, 5 Gallon
Best Sealant
Drylok 275 Masonry Waterproofer Water-Based White, 5-Gallon Pail
Best Budget
Lithi-Tek 9500 Ultra Concentrate - 1 Gallon (Makes 5 GALLONS) Penetrating Concrete Sealer, Waterproofer Plus Densifier
Best For Cracks
Flex Seal Liquid Rubber in a Can, Gray (16-oz)
Best Odor-Blocker
KILZ Restoration Maximum Stain and Odor Blocking Interior Latex Primer/Sealer, White, 1-gallon
Title
Liquid Rubber Foundation and Basement Sealant - Indoor & Outdoor Use - Easy to Apply - Waterproof Coating - Black, 5 Gallon
Drylok 275 Masonry Waterproofer Water-Based White, 5-Gallon Pail
Lithi-Tek 9500 Ultra Concentrate - 1 Gallon (Makes 5 GALLONS) Penetrating Concrete Sealer, Waterproofer Plus Densifier
Flex Seal Liquid Rubber in a Can, Gray (16-oz)
KILZ Restoration Maximum Stain and Odor Blocking Interior Latex Primer/Sealer, White, 1-gallon
Editor's Rating
4.8/5
4.8/5
4.7/5
4.6/5
4.7/5
Prime Status
-
-
-
Best Overall
Preview
Liquid Rubber Foundation and Basement Sealant - Indoor & Outdoor Use - Easy to Apply - Waterproof Coating - Black, 5 Gallon
Title
Liquid Rubber Foundation and Basement Sealant - Indoor & Outdoor Use - Easy to Apply - Waterproof Coating - Black, 5 Gallon
Editor's Rating
4.8/5
Prime Status
Best Sealant
Preview
Drylok 275 Masonry Waterproofer Water-Based White, 5-Gallon Pail
Title
Drylok 275 Masonry Waterproofer Water-Based White, 5-Gallon Pail
Editor's Rating
4.8/5
Prime Status
-
Best Budget
Preview
Lithi-Tek 9500 Ultra Concentrate - 1 Gallon (Makes 5 GALLONS) Penetrating Concrete Sealer, Waterproofer Plus Densifier
Title
Lithi-Tek 9500 Ultra Concentrate - 1 Gallon (Makes 5 GALLONS) Penetrating Concrete Sealer, Waterproofer Plus Densifier
Editor's Rating
4.7/5
Prime Status
-
Best For Cracks
Preview
Flex Seal Liquid Rubber in a Can, Gray (16-oz)
Title
Flex Seal Liquid Rubber in a Can, Gray (16-oz)
Editor's Rating
4.6/5
Prime Status
-
Best Odor-Blocker
Preview
KILZ Restoration Maximum Stain and Odor Blocking Interior Latex Primer/Sealer, White, 1-gallon
Title
KILZ Restoration Maximum Stain and Odor Blocking Interior Latex Primer/Sealer, White, 1-gallon
Editor's Rating
4.7/5
Prime Status

Time for the reviews then. Here we will list the top 5 sealers from different brands and outline their pros and cons. A verdict will follow each product, which will provide our take on each product. So, let us begin!

#1. Liquid Rubber Foundation and Basement Sealant

Sale
Liquid Rubber Foundation and Basement Sealant - Indoor & Outdoor Use - Easy to Apply - Waterproof Coating - Black, 5 Gallon
823 Reviews
Liquid Rubber Foundation and Basement Sealant - Indoor & Outdoor Use - Easy to Apply - Waterproof Coating - Black, 5 Gallon
  • PROTECTIVE FINISH FOR - Foundations, ICF's, Basements, Shower Liners, Deck and Fence Posts, Planter Boxes, Metal, Wood, Concrete and more
  • HIGHLY FLEXIBLE - Sealant final membrane has over 900% elongation in the sealing material preventing adhesion failure causing cracks and taring. Flat/Ponding Surface: 50 sq ft/G per coat
  • EASY TO APPLY - No mixing required! Apply by brush, roller or high quality piston paint sprayer. Container can be closed and left over material used later. No pot life or working time like 2 component products
  • ENVIRONMENTALLY FRIENDLY - Liquid Rubber Foundation Sealant is water based, containing no solvents, VOC's or harmful odors. Safe for humans and pets alike, can be used indoors and outdoors with no special breathing apparatus
  • FOR A BULLETPROOF SYSTEM - Bridge joints, seams, vents, gaps, protrusions…. With Liquid Rubber Seam Tape or Liquid Rubber Geo-Textile where possible movement may occur

Pros

  • Safe for the environment
  • Can be applied using different tools
  • Comes in a resealable container
  • Suitable for different surfaces

Cons

  • Cannot be used on fabric

To kick off this review section, we will start with the liquid rubber and basement sealant from LR stores. Get ready to be impressed with this easy to apply, highly protective- basement sealant.

This particular product is perfect for a wide array of surfaces and settings. While it is used primarily for basements, you can use it to positively affect shower liners, wood, concrete, and more.

Being so useful on a variety of surfaces has its perks. It certainly means you will not have to run to the store just to get a different product for your wooden floor or your deck.

Because of its chemical composition, the molecules that comprise it are well packed, with little spacing between them. This makes them act as a powerful adhesive and prevent cracks from forming on the surface.

Moreover, this product is amazingly easy to apply even for people who have never done such stuff before. You can use a roller, brush, or paint sprayer to get the job done in no time. Also, the container can be sealed back up, so you can store the unused amounts for later.

If you are worried about environmental safety or issues, then worry no more. This product is completely free of VOCs, harmful vapor, or solvents. It will certainly not endanger your life or even your pets.

Verdict: What is eye-catching about this product is how well it can be used on most surfaces. Also, being possible to apply with different tools helps from our experience. Do give this product a shot if you want convenience.

#2. Drylok 275 Masonry Review

Drylok 275 Masonry Waterproofer Water-Based White, 5-Gallon Pail
39 Reviews
Drylok 275 Masonry Waterproofer Water-Based White, 5-Gallon Pail
  • GUARANTEED to stop water - withstands 10 pounds of hydrostatic pressure (PSI), equivalent to a wall of water 22 feet high
  • Fully transferable 10 Year Warranty
  • Helps protect against radon gas penetration by reducing vapor transfer
  • Low-odor formula complies with all current VOC requirements
  • Breathable film will not trap moisture in the masonry

Pros

  • Impervious to radon gas penetration
  • Does not trap moisture
  • Does not require premixing
  • Can withstand a significant amount of water force

Cons

  • Needs a full 24 hours to dry completely

The 275 Masonry from Drylok is an engineering marvel, given the amount of force it can sustain. For heavyweight applications, this is your go-to product.

Able to sustain 10 pounds of water force, this product can survive a 22 feet high wall of water thrown right at it! This impressive capability is possible because of the way it has manufactured.

Once applied, it takes on a film surface that is not impervious to air. Hence, moisture will not settle in, as the film facilitates a constant airflow through it.

When applying, you will be pleased to know that this one does not require any premixing with water or any other chemical, unlike many other sealants. Thus, you can use it straight after buying it.

One of its key features is that it protects you from radon gas leakages that may waft through the air. Radon is toxic and can cause death, but this product prevents radon gas from seeping through walls or crevices.

While applying this product, you will not be put off by smells or odors, as it releases no harmful VOCs. Hence, it is entirely safe to use anytime, anywhere.

Verdict: A product that can deal with radon gas and stop it from spreading is all aces in our books. This product has several other features, among which is its amazing water force resisting ability.

If you value safety and quality, this is an all in one package.

#3. Lithi-Tek 9500 Ultra Concentrate – 1 Gallon

Lithi-Tek 9500 Ultra Concentrate - 1 Gallon (Makes 5 GALLONS) Penetrating Concrete Sealer, Waterproofer Plus Densifier
176 Reviews
Lithi-Tek 9500 Ultra Concentrate - 1 Gallon (Makes 5 GALLONS) Penetrating Concrete Sealer, Waterproofer Plus Densifier
  • An industrial-grade, water-based, proprietary sealer designed to densify, strengthen and waterproof concrete: increasing abrasion resistance while reducing moisture and vapor intrusion
  • Prevents efflorescence
  • Reduces hydrostatic pressure, water vapor transmission, moisture intrusion and ASR
  • Increases concrete’s abrasion resistance and strengthens concrete up to 50%
  • Available in an industry first ultra-concentrate, 1 gallon of Lithi-Tek 9500 mixes with 4 gallons of water to make 5 gallons of sealer that will treat up to 1000 sq. ft. of concrete per coat.

Pros

  • Prevents deposit of salts or residues on the concrete
  • Tested to enhance strength
  • Makes concretely impermeable to water
  • Can withstand hydrostatic pressure due to water

Cons

  • It is a bit unsuitable to use if the water is in short supply

A fully industrial grade product, the 9500 Ultra Concentrate is the professionals’ stuff, made by professionals. Made with a special type of water-based sealer, it has been engineered to add strength and waterproof concrete itself.

The concrete will, in turn, become tougher, more durable, and more resistant. This includes resistance to moisture damage and abrasions. Tests and studies have decisively proven that concrete on which this product is applied gets a 50% boost in strength and wear resistance.

This will significantly cut down the risk of damage by hydrostatic or water force. That implies the surface on which it is applied will be more resistant to water jets. Also, moisture seepage is minimized, which would otherwise ruin the concrete.

While the container may only hold one gallon of liquid, this single gallon can be mixed with up to 4 gallons of water. This effectively makes 5 gallons of sealant, which is five times more than what you initially had to work with.

The 5 pound of sealant is more than sufficient to cover up to 1000 square feet of concrete, making this product highly economical.

Verdict: More is always better, and making 5 gallons out of 1 gallon is a game-changer. Not to mention it has been rigorously tested by the best. What we wrote here only captures a part of its features; try it to see how well it performs.

#4. Flex Seal Liquid Rubber in a Can

Flex Seal Liquid Rubber in a Can, Gray (16-oz)
1,231 Reviews
Flex Seal Liquid Rubber in a Can, Gray (16-oz)
  • Flex Seal Liquid is liquid rubber in a can! Now you can brush, roll, dip or pour it on!
  • Use anywhere you need a watertight, flexible rubberized coating
  • Goes on smooth and covers fast, sealing out water, air and moisture
  • Non-hazardous, non-toxic, non-flammable, UV-resistant. Even safe for plants and animals once cured
  • Prevents rust and corrosion. Mildew and chemical resistant

Pros

  • Resistant to abrasion and wear
  • Safe to use around animals
  • Can be applied by any method
  • Offers quick waterproofing

Cons

  • Should be handled with gloves on, as it can be tough to remove

The 16 oz weighing liquid rubber in a can from Flex Seals is appropriately named. It is truly like carrying a liquid rubber in a can that can be used quickly and smoothly to cover just about any surface.

This product can be applied in a plethora of ways. You can use a brush to paint it, a roller to roll it on surfaces, or if you are feeling particularly daring, just pour it on! No matter how you use it, it will provide excellent service each time.

If you have a crevice or crack that needs waterproofing, this product is for you. It can be used to apply a coating that is quick to dry and instantly to waterproof. Furthermore, it also seals out moisture and air so that the area being sealed off stays that way.

While many sealants in the market provide adequate sealing, they sometimes tend to be attacked by mildew or simply corrode away. That means you will have to repeat the painting process all over again.

However, this product is resistant to such attacks from mildew. It is also highly corrosion-resistant, meaning you probably just have to apply once to get the desired effect.

On a final note, it is also non-toxic and non-hazardous material. So, you can use it safely around the house, even if you have pets or plants around.

Verdict: Easy to use, safe, and sticks around is what every sealant should be like, and what this product actually is. This product offers a quick solution to deep problems, making it worth the investment.

#5. KILZ Restoration Maximum Stain and Odor Blocking

Sale
KILZ Restoration Maximum Stain and Odor Blocking Interior Latex Primer/Sealer, White, 1-gallon
399 Reviews
KILZ Restoration Maximum Stain and Odor Blocking Interior Latex Primer/Sealer, White, 1-gallon
  • KILZ Restoration (formerly KILZ MAX) is a water-base primer, sealer and stain blocker developed with new technology that is formulated to perform like an oil-based product.
  • It tackles tough stains including medium to heavy water damage, rust, smoke, nicotine, grease, tannin, ink, pencil, felt marker, pet stains and more.
  • Topcoat with latex or oil-based paint. Use on properly prepared interior surfaces, such as: brick, ceramic tile, drywall, glass, masonry, painted metal, plaster, stucco and wood.
  • Use on properly prepared surfaces free of dust, grease, chalk, mold, rust and peeling paint. Mix well before using. Apply with brush, roller or airless sprayer.
  • This is a 1-gallon can of KILZ Restoration Latex Primer, Sealer, and Stain blocker for interior surfaces in white. Covers approximately 300-400 square feet per gallon.

Pros

  • Can be used on a variety of surfaces
  • Covers a sufficiently large area
  • Can deal with hard or bad-smelling stains
  • Blocks out harmful, strong-smelling odors

Cons

  • Must be mixed before use

The final product on our list today is the Maximum stain and odor blocking interior latex sealer from KILZ stores. This newly and rather uniquely developed sealer is the perfect product for your basement.

Made with the latest sealant technology, it has been specially developed to perform like an oil-based solvent. This is in stark contrast to other types of sealants that are primarily water-based solvents.

What makes it so useful is that it can tackle a range of different types of damages. This starts from the small, such as smoke and nicotine, and includes the large damages resulting from inkblots, grease, and permanent markers.

It also possesses a great degree of versatility. For instance, it can be used equally well on different surfaces, such as wood, glass, metal, and even ceramics. This is one reason why it is such a popular choice.

While it may come in a one-gallon container, do not be mislead into thinking that it cannot be used for projects. As a matter of fact, it is perfect for projects that measure up to 300 or even 400 square feet in area. That makes this product amazingly economical for the gallon.

When using it on wood, plaster, or drywall, you will be taken aback by its superior adhesion and adhesive properties. It dries amazingly hard and also blocks the spread of strong or noxious odors, such as smoke from fires.

While used properly and with the right tools, this product is a fantastic deal and one to keep in the garage.

Verdict: When technology meets quality, amazing things happen, and this product is testimony to that. Engineered to block out most odors, strong or subtle, this is a must-have for the house.

Covering up the most stubborn stains has never been easier until now, that is!

What to Consider Before Buying the Best Basement Wall Sealer?

So, now that the reviews are out of the way, it is time for this guide’s next segment.

Here, we will talk about what you should look for before you buy a basement wall sealer. These pointers will help you get the best out of your money and get a more efficient and ultimately safer product.

So, let us dive right in!

Environmentally Safe

This point cannot be stressed, especially with the current issues regarding pollution and health damage. A sealer must be free of noxious, toxic odors and chemicals.

The most common chemical found in many paints or sealing reagents is volatile organic compounds (VOC). VOC’s are particularly harmful to the body and have been linked to brain and kidney damage, especially in children.

Surprisingly, the World Health Organization estimates that 3.8 million people die annually due to prolonged exposure to such chemicals and compounds.

Hence, it is essential you buy a sealer that is free of VOC and any other harmful chemical, such as CFC’s or chromium. Most modern-day sealers are made free of such items, but it still prudent to talk to the manufacturer before making the purchase.

Colorless or Painted

Basement wall sealers can be colorless or painted. The painted one will add a layer of gloss or sheen to your walls, making it glow and look new again. If you are sealing indoor walls and people go in and out of the basement, a painted sealer is a good choice.

As the name implies, the colorless one has no color and is, in fact, transparent. This type of sealer is commonly used on outside walls because walls on the outside already have a distinct color.

Hence, this type of sealer is recommended for outside use

Is Versatile to Some Extent at the Very Least

By versatile, we mean that the same sealer can be applied to a variety of different surfaces and achieve the same effect.

These surfaces include concrete, wood, plywood, stone, masonry, and more. Getting a sealer that is applicable on most common surfaces will surely save you some hard-earned cash.

Furthermore, it will save multiple trips to the store if you have different surfaces that require sealing. You can just use on for all, every time.

Can Be Applied in Various Ways

This is more of a convenience factor if anything, but it certainly makes your job faster.

Many sealers can be applied using a number of methods, such a rolling, brushing, painting, or spraying. This means you can use whichever tool is at your disposal to get started.

One key advantage of such sealers is that you split a large task more easily. For instance, one person can apply the sealer using a brush, another using a roller, and so on. This will eventually make the task smoother.

But always check whether the sealer can be applied by using different painting tools, as some products can only be applied in a specific way, such as spraying.

What Is a Basement Wall Sealer?

To put it in simple terms, a sealer is anything that seals or blocks off any or certain types of material from entering a certain zone or area.

A wall sealer is a combination of chemicals and reagents that block off pores or cracks when applied on a solid surface, such as concrete.

They prevent the entry of moisture and liquids, protecting the concrete underneath. A basement wall sealer is a sealer specially made for basements. Basements tend to be damper than other rooms, and their walls are easily damaged.

A basement wall sealer, if appropriately applied, will prevent wall damage.

Is It Better to Waterproof Basement from Inside or Outside?

Waterproofing your basement is a must, but questions may arise as to which side you should waterproof, inside, or out? There are several opinions on this, but we will provide a general idea.

Exterior waterproofing is mainly done to address the problem from the outside. Most of the water in contact with basement walls is on the outside, making more sense to secure the outer walls. In fact, this is highly recommended and more common too.

However, in rare cases, the walls may be affected from the inside. This may happen due to a burst pipe or underground water seeping through. In these cases, interior waterproofing is needed, as the problem is situated indoors.

Whichever the case, the sealant will perform the same both ways. But, unless required, waterproofing from the outside is more practical.

How to Waterproof Your Basement Wall Using a Sealer?

Knowing how to waterproof the basement is important and can prevent further damage. Hence, here we will briefly discuss what you should do to waterproof using a sealer.

Know The Damage

This means getting to know the reasons for the damage. It could be for a number of reasons, such as mildew, mold, moisture, etc. So, do a thorough check to inspect the problem.

Locate The Exact Area

Next, locate the exact area where the sealant will be applied. This ensures that not too much sealant is wasted.

Prepare The Sealant

Now, prepare the sealant by mixing if needed. Use a brush or roller to apply the sealant on the area firmly but not hastily. Allow it time to settle.

Let It All Dry

Then, after it’s all done, let it dry for a day or two.

What Are the Benefits of Sealing Basement Walls?

Sealing a basement wall can have several benefits. Here we will list a few.

Keeps Mold Away

Mold is a pesky annoyance and is a top reason for wall damage. Sealing the wall cuts od mold growth and essentially protects the wall.

Prevents Moisture Accumulation

A sealed wall is impervious to moisture and humidity. This will prolong the lifespan of the wall.

Makes The Wall Glossy

This is an added bonus of sealing the walls. Sealants add a natural shine to the wall and make them look new again.

What Should You Keep in Mind While Sealing the Basement Wall?

While sealing the basement wall, you would want to go the extra mile just to ensure that work you are putting in turn out fruitful. Otherwise, it is time wasted. Hence, we put together a few pointers to keep in mind while sealing the wall.

Clean the Surface Beforehand

This is very important. The surface of the soon to be sealed wall must be free of dirt or impurities. Otherwise, the sealant will not set in.

Inspect All the Cracks

Cracks must be investigated before applying the sealant. This helps to determine how much of it is required.

Let It Dry

Don’t rush into things, and let the sealant dry. This may take a day or a few, depending on the quality and quantity applied, but just admire your work from afar till then.

Frequently Asked Questions (FAQs)

Time for the FAQ section. Here we will answer some of your most common questions in a succinct yet informative manner.

Hopefully, you will have all your queries answered here.

#1. What is the best basement wall sealer?

Answer: We have reviewed five top brands of basement wall sealers. They all have their pros and cons, but we have a decision regarding one in particular.

From our analysis, the KILZ Restoration Maximum Stain and Odor Blocking sealant are the best for your basement wall sealer. It is made with high-end technology, and it provides the best sealing against moisture, mold, and fungi.

#2. What is the best basement waterproofing sealer?

Answer: As you now know, waterproofing can be of paramount importance. Waterproofing can prolong the longevity of the walls and keep them stronger.

From our analysis and experience, we so firmly believe that the Flex Seal Liquid Rubber in a Can is the best possible product you can use to waterproof your basement. It is easy to use and not to mention safe. All in all, it is a fantastic product.

#3. Does Flex Seal work on basement walls?

Answer: Flex Seal is a highly useful and versatile product that works on all walls. So yes, it will work on basement walls quite well. However, be aware of using it carefully and not miss out on cracks and crevices.

#4. How do you stop a leaking basement wall?

Answer: A leaky basement wall can be stopped to leak in a number of ways, but here we will discuss the most common method. To stop the leak, you first have to identify the crack or the region where the water is seeping out.

This region is enlarged using a chisel, and a suitable dimension hole is made. If the space inside has water, it is drained out. Debris and dirt must be cleaned out of the hole, and then the hole should be dried.

After mixing the sealant to form a putty or dough-like substance, you can apply it by hand on the crack. Make sure the putty covers the hole completely and scrape off any excess putty.

#5. Is Drylock good for basement walls?

Answer: Drylock is very popular and is very good for the walls. It can be used for basement walls without worry, as it has a strong resistance against water forces.

#6. How do you seal cracks in concrete basement walls?

Answer: The first step is to clean the crack and remove any debris. Next, if the crack is non-uniform is width, make it a bit wider to ensure it is uniform. After mixing the sealer, insert it bit by bit into the crack via an insertion port. This port is a plastic tubing that allows you to inject the sealer.

Once this is done and the cracks are properly sealed, apply the sealer on the outside and cover the entire crevice. Then leave it to dry.

#7. How do you seal a stone basement wall?

Answer: A stone wall can be damaged over time due to moisture or fungus, and this will require sealing to reverse. To seal a stone basement wall, you first have to install drainage channels inside the wall that lead to the outside. This will eliminate all moisture and water inside. A professional can do this.

Next, apply the sealer just like you would for any other case, by mixing it and forming a putty. Apply to the entirety of the cracks, and be sure not to miss any region out.

#8. What’s the difference between Drylok and Drylok extreme?

Answer: Drylok and Drylok extremes have very similar properties. However, the difference lies in how much pressure they take from water forces. The Drylok can take about 10 pounds of hydrostatic pressure, and the Drylok extreme can take about 15 pounds.

Final Words

So, that concludes yet another article from us. As we have demonstrated, you should desire to use nothing less than the best basement wall sealer for your basement walls.

Anything less will damage the walls and take you back to square one. Hence, don’t hesitate any longer and give your walls the treatment they deserve. Go get the best sealer out there and let it work its magic!

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