Best Basement Wall Sealer Reviews of 2021: Our Top 5 Picks

Best Basement Wall Sealer Reviews

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 basement 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 high-quality basement wall 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 waterproofing sealer will ensure you spend the least for the best.

Hence, worry no longer, and check out our top waterproofing basement wall 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
Full Review
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
-
Full Review
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
-
Full Review
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
-
Full Review
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
Full Review

Time for the reviews then. Here we will list the top 5 basement wall sealers from different brands and outline their pros and cons. A verdict will follow each basement waterproofing sealer, 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
1,051 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 basement waterproofing sealer 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 basement waterproofing sealer 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 basement wall sealer 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 basement wall sealer 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 basement wall sealer a shot if you want convenience.

#2. Drylok 275 Masonry Review

Drylok 275 Masonry Waterproofer Water-Based White, 5-Gallon Pail
55 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 basement wall sealer.

Able to sustain 10 pounds of water force, this basement wall sealer 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 basement wall sealer prevents radon gas from seeping through basement walls or crevices.

While applying this basement wall sealer, 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 basement wall sealer 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
225 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 basement wall sealer, the 9500 Ultra Concentrate (concrete sealers) 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. The concrete sealers include resistance to moisture damage and abrasions. Tests and studies have decisively proven that the concrete on which this basement wall sealer 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 sealant is more than sufficient to waterproofing your basement to cover up to 1000 square feet of concrete, making this basement waterproofing sealer 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)
1,809 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 basement waterproofing sealer 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 waterproofing your basement.

If you have a crevice or crack that needs waterproofing, this basement waterproofing sealer is for you. It can be used to apply a coating that is quick to dry and instantly 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 basement waterproofing sealer is resistant to such attacks from mildew. It is also highly corrosion-resistant, meaning you probably just have to apply it 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 basement waterproofing sealer actually is. This basement waterproofing sealer offers a quick solution to deep problems, making it worth the investment.

#5. KILZ Restoration Maximum Stain and Odor Blocking

KILZ Restoration Maximum Stain and Odor Blocking Interior Latex Primer/Sealer, White, 1-gallon
473 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 basement waterproofing sealer on our list today is the Maximum stain and odor blocking interior latex basement wall sealer from KILZ stores. This newly and rather uniquely developed basement wall sealer is the perfect basement waterproofing sealer for your basement.

Made with the latest sealant technology, it has been specially developed to perform like an oil-based solvent. This waterproofing paint 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 basement waterproofing sealer amazingly economical for the gallon.

When using this waterproofing paint 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 basement waterproofing sealer is a fantastic deal and one to keep in the garage.

Verdict: When technology meets quality, amazing things happen, and this basement waterproofing sealer 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!

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 high-quality 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 basement 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 basement 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 basement wall 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 basement wall 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 basement wall 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 waterproofing sealer for your basement walls.

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

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Meet the Authors

Heenan, Cannon, Mack, and Theodore are four outdoor enthusiasts. Each of them is a handyman and off-road adventurers. Dealing with different tools, automotive accessories, products related to home like sealers are some of their day-to-day tasks. They run this website to share their thoughts on various items they think are good or bad for others. Learn how they started as The Handyman Guru, and why they decided to start this blog..

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