Concrete is an incredibly stable and durable material. While versions of cement are millennia old, modern hydraulic concrete was first created in 1756. Concrete buildings, bridges, and other surfaces that are hundreds of years old are still standing today.
But concrete is not indestructible. Naturally occurring cracks, and those caused by poor design, do happen. Luckily, the best concrete crack fillers can repair those cracks in foundations, driveways, walkways, sidewalks, patios, and more, making them virtually disappear. Keep reading to learn more about repairing these unsightly situations and some of the best concrete crack fillers on the market to do the job.
- BEST OVERALL: Sikaflex Self-Leveling Sealant
- BEST BANG FOR THE BUCK: Sashco Slab Cement Crack Filler
- BEST FOR FOUNDATIONS: RadonSeal DIY Foundation Crack Repair Kit
- BEST FOR LARGE CRACKS: Red Devil Pre-Mixed Concrete Patch
- BEST FOR THIN CRACKS: Bluestar Flexible Concrete Crack Filler
- BEST DRYING TIME: Drylok Fast Plug Hydraulic Cement
- BEST EPOXY: PC Products PC-Concrete Two-Part Epoxy
- BEST LIQUID: DAP Liquid Cement Crack Filler
- BEST FLEXIBLE: Latex-Ite Pli-Stix Asphalt Crack Filler
- BEST WATERPROOF: Rust-Oleum Concrete Patch & Repair
- BEST SELF-LEVELING: Rapid Set Self-Leveling Sealant
- ALSO CONSIDER: Damtite Waterproofing SuperPatch
How We Chose the Best Concrete Crack Fillers
Our list of recommendations for the best concrete crack fillers was built from extensive research on the various types of products on the market, from ready-made mixtures that can be used in a simple caulking gun to powder products that you can mix yourself to tailor the mixture precisely how you need it. We made sure to provide options for the wide spectrum of needs and uses for crack fillers.
Most of our top picks boast quick drying times, while all are from reputable manufacturers that use quality materials, even across a range of budgets. From hairline cracks to larger and more problematic cracks in a foundation, our list can help shoppers find the perfect solution for a given project.
Our Top Picks
The best concrete crack fillers can make an unsightly crack a distant memory in one afternoon. The following products are considered among the best on the market, and one is sure to be the right choice for your projects.
Whether it’s a small crack or a wide gap, Sikaflex self-leveling sealant is up to the task. This product can fill gaps up to 1.5 inches wide on such horizontal surfaces as floors, walkways, and patios with ease. Once fully cured, it remains flexible as well as entirely submersible, making it suitable for pool repairs or other areas exposed to water.
Sikaflex comes in 10.1-ounce containers that fit standard caulking guns. Simply squeeze the product into the crack and, thanks to its self-leveling quality, little to no tool work will be necessary for a uniform finish. Fully cured Sikaflex can be painted, stained, or sanded to your desired finish.
- Size: 10.1 ounces
- Curing time: 3 to 5 days
- Application: Cartridge gun
- Easy to use; simply caulk the sealant into the crack and wait 3 to 5 days
- Ready-made mixture for convenience and user-friendliness
- Ideal for multiple concrete applications
- Long curing time compared to some alternative products
Get the Sikaflex concrete crack filler at Amazon, Lowe’s, The Home Depot, or Walmart.
The cost-effective Sashco’s slab concrete crack repair is all about flexibility, stretching up to three times the width of the cracks it repairs. This sealant can handle cracks up to 3 inches wide on sidewalks, patios, driveways, floors, and other horizontal concrete surfaces.
This 10-ounce concrete crack filler fits in a standard caulking gun and flows easily, allowing users to squeeze it into small or large cracks without trowels or putty knives. Once cured, it remains elastic and flexible, preventing further damage from freeze-thaw cycles. This concrete crack repair is also paintable, so you can blend the repair joint with the rest of the concrete surface.
- Size: 10.5 ounces
- Curing time: 1 week
- Application: Cartridge gun
- Easy to apply; simply caulk the sealant into any cracks on the driveway
- Can be used on a variety of surfaces, including sidewalks, patios, driveways, floors, and more
- Ideal for gaps of up to 3 inches
- 1 week cure time is quite long compared to similar options
- May not be suitable for vertical applications
Get the Sashco concrete crack filler at Amazon, Lowe’s, Ace Hardware, or Walmart.
Filling concrete cracks in foundations often takes a specially designed product—and RadonSeal is a wise choice to get the job done. This concrete repair kit uses epoxy and polyurethane foam to fix cracks up to 0.5 inch thick in basement foundations and concrete walls.
This kit includes two tubes of polyurethane foam for filling the crack, injection ports for adhering over the crack, and two-part epoxy for sealing the crack before injecting. There’s enough material to fill cracks up to 10 linear feet long. The repair will prevent water, insects, and soil gasses from penetrating the foundation, keeping homes safer and drier.
- Size: Enough to fill up to 10 feet of cracks
- Curing time: Unspecified
- Application: Caulking gun
- The comprehensive kit allows filling, adhering, and sealing the epoxy
- No specialized tools are required for proper application
- Prevents water and insects from penetrating the surface
- Some users have reported quick drying times; may need to be mixed in small doses
Get the RadonSeal concrete crack filler at Amazon or RadonSeal.
When dealing with a large crack in concrete or a missing chunk of masonry material, repair might require a substantial product like Red Devil’s premixed concrete patch. This product comes in a 1-quart tub; it’s premixed and ready for use.
Red Devil premixed concrete patch is suitable for large cracks in sidewalks, walkways, and patios as well as vertical surfaces both indoors and out. Application simply requires you to push it into the crack with a putty knife and smooth it along the surface. Red Devil adheres well, dries to a light concrete color, and won’t shrink or crack, resulting in a long-lasting fix.
- Size: 1 quart
- Curing time: At least 24 hours
- Application: Trowel or putty knife
- Ready-mixed tub for convenience and user-friendliness
- Suitable for use in driveways, sidewalks, walkways, and patios
- Simple cleanup with soap and water after dried
- Color may not match all concrete varieties
Get the Red Devil concrete crack filler at Amazon, Blain’s Farm & Fleet, Shell Lumber, Toolbox Supply, or Walmart.
Hairline cracks can be challenging, and they require a thinner liquid material to penetrate and seal off the gap. The Bluestar flexible concrete crack filler’s liquid formula seeps into those skinny cracks to create a long-lasting repair that remains flexible in hot and cold weather.
This1-pound bottle of concrete crack filler is easy to apply: Simply remove the cap on the nozzle and squeeze the liquid over the crack before troweling it smooth with a putty knife. After it cures, you can paint it to match the concrete surfaces and rest assured that the repair will keep bugs, grass, and water from penetrating.
- Size: 16 ounces
- Curing time: 24 hours
- Application: Squeeze bottle
- Works in both hot and cold weather; will not warp or wear with temperature fluctuations
- Very easy to apply compared to other available options; squirt-top gets right into deep cracks
- Thinner liquid material is ideal for hairline cracks
- Solution is runny and can be messy
Get the Bluestar concrete crack filler at Amazon or Walmart.
When time is of the essence, Drylok’s cement hydraulic dry mix is worth consideration. This mix sets within 5 minutes, making it suitable for patches in a variety of masonry surfaces.
The hydraulic cement mix comes in a 4-pound tub and works to repair cracks in masonry, brick walls, and concrete surfaces. It can also anchor metal, such as brick ties, to a concrete surface for a long-lasting repair. Once cured, the resulting material is extremely hard and durable, capable of blocking out soil gasses and holding back over 3,000 pounds of water from flowing through a crack or hole.
- Size: 4 pounds
- Curing time: Unspecified
- Application: Trowel or putty knife
- Sets very quickly; ideal for fast repairs to minor cracks
- Great at fixing leaks as well as deep cracks
- Budget-friendly option comes with 4 pounds of filler
- Requires mixing with water before being applied
Get the Drylock concrete crack filler at Amazon, Lowe’s, Ace Hardware, or The Home Depot.
It can be difficult to find a product that’s both strong and fast curing, but PC Products PC-Concrete two-part epoxy checks both boxes. This epoxy can fix cracks or anchor metal like lag bolts and other hardware into concrete, creating three times the strength of the concrete it adheres to. And, with a 20-minute set time and a 4-hour curing time, it’s ready for heavy lifting quickly.
This two-part epoxy comes in an 8.6-ounce tube that fits into a standard caulking gun. An innovative mixing nozzle frees you from worrying about mixing the two parts correctly. The cured epoxy is waterproof and fully submersible, and it works on sidewalks, driveways, basement walls, foundations, and other concrete surfaces.
- Size: 8.6 ounces
- Curing time: 4 hours (at 75 degrees Fahrenheit)
- Application: Cartridge gun
- Cures very quickly; can be driven on within 4 hours of application
- Simple application style; comes with precision applicators for ease of use
- Suitable for humid environments as well as damp concrete
- Material can be quite difficult to dispense compared to thinner products
Get the PC Products concrete crack filler at Amazon, The Home Depot, Max Warehouse, or Paint Supply.
Rather than struggling with patch and concrete mix for small cracks, consider DAP’s liquid cement crack filler. This liquid concrete crack filler comes in a 1-quart bottle and works its way into small cracks (up to 0.5 inch) to create a bond that’s ready for traffic in 45 minutes.
This liquid cement crack filler is self-leveling so there’s no need to use a putty knife or trowel to create a smooth, even repair. While it’s not ideal for vertical surfaces like walls or foundations, it’s suitable for such horizontal surfaces as driveways, walkways, patios, and concrete floors, both inside and out. Once cured, DAP crack filler is paintable, so blending the repair won’t be an issue.
- Size: 1 quart
- Curing time: 24 hours
- Application: Squeeze bottle
- Easy squeeze-bottle application for user-friendliness and quick application
- Ideal size for moderate cracks or hairline cracks
- Self-leveling liquid formula prevents pooling and dents
- Ready-mixed product for convenience
- Runny liquid not ideal for larger applications
Get the DAP concrete crack filler at Amazon, Lowe’s, Ace Hardware, Grainger, or Walmart.
Those who worry about stubborn cracks that expand or warp due to temperature fluctuations can rely on the Latex-Ite Pli-Stix crack filler. This permanent solution to cracks is made with thermoplastic rubber and fits into driveway abrasions of up to 0.5 inch wide, melting in 20 to 30 seconds into a watertight seal. Once applied with a heat gun or propane torch, this self-leveling and flexible option stays put indefinitely.
For added convenience, you can use the driveway 20 minutes after application in nonhumid weather conditions. However, this 60-foot concrete crack sealant only comes in black and may not suit some driveways.
- Size: 60 feet
- Curing time: 20 minutes
- Application: Heat gun or blow torch
- Melts into any cracks that are 0.25 to 0.5 inch in size
- Made with melting thermoplastic rubber that dries to a watertight finish
- Will not expand or wear out with temperature fluctuations
- Can be used within 20 minutes of application
- Only comes in a black colorway
- Requires a heat gun or propane torch for proper application
Get the Latex-Ite concrete crack filler at Amazon or The Home Depot.
Ensure that your driveway stays completely intact season after season no matter the weather with the Rust-Oleum concrete patch and repair. This 24-ounce pick is made with a two-part industrial-strength epoxy that dries stronger than concrete itself and can cover over 14 linear feet of cracks. With its durable finish, this option permanently bonds concrete without shrinking or cracking.
Simply apply indoors or outdoors and wait 8 hours before painting. Finally, this top pick is easy to mix, has no solvents, and has a low-odor formula.
- Size: 24 ounces (14 linear feet)
- Curing time: 8 hours
- Application: Epoxy
- Industrial-strength epoxy provides a watertight seal that is stronger than actual concrete
- 1 unit can repair over 14 linear feet of cracks; can be used indoors or outdoors
- Permanent solution to cracks and abrasions; will not expand or warp in temperature fluctuations
- Low-odor compound and does not contain any solvents
- Requires some mixing before use
- Some users have reported issues using this crack filler on vertical surfaces
Get the Rust-Oleum concrete crack filler at Amazon, Lowe’s, The Home Depot, Grainger, Menards, or Walmart.
Keeping a driveway level can help prevent pooling or damage from getting too far. For repairing cracks and keeping the driveway level, rely on the Rapid Set self-leveling sealant. Made with hybrid silane polyether, this ultraviolet (UV)-stable sealant is made to outlast silicone and polyurethane for a permanent solution to sealing cracks in concrete, brick, block, stone, masonry, wood, metal, and more.
Made with an easy-to-apply caulk, this sealant is made for horizontal applications and comes with 28 ounces of product for multiple uses or large applications.
- Size: 28 ounces
- Curing time: 72 hours
- Application: Sealant and caulk
- Self-leveling formula is ideal for repairing deep cracks and keeping driveways flat
- Made with UV-stabilized hybrid silane polyether, which is a permanent solution to cracks
- Suitable for a lot of different surfaces including concrete, brick, block, stone, masonry, wood, metal, and more
- May take slightly longer for very heavy applications to dry
Get the Rapid Set concrete crack filler at The Home Depot.
Filling large cracks, deep depressions, or areas with missing material can be tough with a caulk or liquid. Fortunately, Damtite’s SuperPatch can remedy all those big issues and more. This waterproof patching compound uses a unique nonshrink formula that can be applied to concrete surfaces in 1-inch-thick layers, up to 3 inches thick.
This patch kit comes with 6 pounds of patching powder and 1 pint of liquid additive, so you can mix as much or as little as needed to patch or resurface concrete surfaces. For reference, one of these containers will cover up to 3 square feet of patio, driveway, or other concrete surfaces in a layer 0.25 inch thick. You’ll have to trowel it into the crack or over a cracked surface.
- Size: 7 pounds
- Curing time: 48 hours
- Application: Trowel or putty knife
- Provides a waterproof finish; ideal for protecting wet-prone surfaces
- Great for larger projects; comes with 7 pounds of filler
- Can be used on driveways, patios, walkways, and other concrete surfaces
- Users need to mix the products
Get the Damtite concrete crack filler at Amazon, The Home Depot, or Walmart.
What to Consider When Choosing a Concrete Crack Filler
Concrete cracks happen for various reasons. Sometimes a natural shift in the ground from a freeze-thaw cycle is to blame. Cracks can also occur if concrete was mixed with too much water or allowed to cure too quickly. Whatever the case may be, there’s a quality product for patching those cracks. Here are the factors and features to keep in mind as you shop.
Crack fillers for concrete come in a few varieties, and some are better for a particular type of repair than others.
- Concrete crack sealants and caulks are the most common product used to fill cracks in concrete. They come in squeeze tubes and can be applied right into the crack with a caulking gun. Both do a good job of keeping out water and bugs. The main difference? Caulks tend to dry faster, while sealers tend to last longer.
- Quick-setting cement, just as it sounds, is a concrete mix that sets fast. Most often, these products come as a bag of dry mix that you blend with water. They’re excellent for fixing large cracks.
- Patching compounds are an attractive alternative to quick-setting cement as they tend to come premixed. They’re also a good choice for repairing larger cracks.
- Hydraulic cement is a dry mix (sometimes available as a premix) that you can apply to cracks in areas frequently exposed to water, such as pools, foundations, cisterns, and outdoor fountains.
- Concrete resurfacer is a relatively standard mix of concrete plus additional polymers. These polymers increase the strength of the concrete, prevent future cracks, and make it suitable for applying in thin applications. They’re ideal for fixing several cracks in a surface.
- Epoxy resurfacers, a combination of a resin and a hardener, are entirely waterproof and can be useful for sealing off cracks in basement and foundation walls as well as horizontal surfaces. But you’ve got to work fast: Epoxy resurfacers harden very quickly.
The width of the crack is a major consideration when choosing a concrete crack filler. Thin cracks need a different approach and material than a thicker, wider crack.
For hairline cracks, choose a liquid concrete crack filler or thin caulk, which can flow easily into the crack and fill it. For medium-size cracks (about 0.25 to 0.5 inch), a thicker filler, such as a heavier caulk or patching compound, might be necessary.
For larger cracks, quick-setting concrete or a patching compound might be the best bet. A standard concrete mix might also do the job, and you can mix as much as you need to fill the crack. Finishing with a resurfacer can help hide the repair and add more strength.
All concrete crack fillers should be weather-resistant and able to keep water out. Penetrating water can degrade the quality of concrete over time, causing it to crack and crumble. Sealers are especially good for this purpose, as they fill the crack and reduce the porosity of surrounding concrete. In areas where temperatures tend to fluctuate, consider investing in flexible concrete crack fillers that can adapt to hot and cold conditions.
Northerners take note: Keeping water out is particularly important in colder climates. When water penetrates a concrete surface and the temperature drops below zero degrees Celsius, ice forms—and expands. This can cause massive cracks, foundation failures, and crumbling walls. Frozen water can even push concrete blocks right out of their mortar.
Each product has its own curing time, which is essentially the time it takes to dry fully and be ready for traffic. Some materials also have set times, which means it’s not quite dry but won’t move or run, and might even survive light rain.
Though manufacturers don’t typically indicate set or cure times in product descriptions, most quality products will set within the hour and cure within a few hours. If a product requires mixing with water, the amount of water used will have some bearing on cure time.
Before beginning a repair, consider the weather and temperature. The material will dry faster in warmer weather—but if you’re using concrete mix, you don’t want it to dry too quickly or it will crack again. You might need to keep the surface of larger patched cracks damp in hot weather.
Many but not all liquid caulks, sealers, and patches come premixed. Dry mixes require water, followed by hand mixing until they reach the desired consistency—which could be a combination of the manufacturer’s recommendations and how runny you need it to be. It’s best to follow mixing directions as closely as possible, but you can thin the mix with a minimal amount of extra water if absolutely necessary.
In the case of an epoxy, you’ll mix a resin compound with a hardener. Luckily, most concrete epoxies come in tubes with self-mixing nozzles. Just be aware that these products become very hard very quickly, so you’ll have a limited amount of time to tackle the job. They’re common in foundation repair kits as they can be applied on vertical surfaces and block groundwater from seeping through.
There are a few different methods for applying the best concrete crack fillers, and the one you choose will depend on the product and the size of the crack.
Liquid fillers come in small jars, and they’re easy to drip right into the crack. Caulks and sealers may be applied with a caulk gun for small- to medium-size cracks. Many of these products are self-leveling concrete crack fillers as well, which means users shouldn’t have to smooth them out to ensure a uniform finish.
If going with a concrete mix or patch (dry or premixed) for larger cracks, it’s usually best to apply with a trowel or putty knife, pushing the material into the crack and smoothing it off at the surface. Resurfacers might require a float (a flat, wide tool meant to flatten masonry materials) to apply a smooth, even coat.
Though you’re now armed with ample info on the best concrete crack fillers, some more questions might pop up. Check for the answers to your question below.
Q. How do you fill large cracks in concrete?
Filling large cracks usually requires a thicker compound like concrete or a patching compound.
- Clean the crack with a brush and vacuum, or blow any dust out of the crack.
- Using a trowel, push the mix into the crack.
- Trowel over the compound to smooth it out.
- Allow it to dry according to the directions.
Q. How do you fix hairline cracks in concrete?
The easiest way to fill a hairline crack is to use a liquid crack filler. Squeeze a bead of filler over the crack and then use a trowel to push the filler into the gap.
Q. How long does concrete filler take to dry?
It depends on the material, the width of the crack, and the temperature. Some fillers dry in under an hour, while others can take 24 hours or longer to cure.
Q. How do you remove concrete crack filler?
The easiest way to remove concrete crack filler is to use an angle grinder and grind along the edge of the filler.
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