If you need to repair a concrete crack between .25 inches wide and 1.5 inches wide and .5 inches deep, our top recommendation is the Sikaflex Pro Self-Leveling Sealant. Once cured, it has excellent adhesion but remains slightly flexible, making it ideal for use in cracks exposed to weather extremes.

This polyurethane sealant dries to the touch in just one or two hours but can take three to five days to fully cure. You can use it on freshly poured concrete that has cured for at least 24 hours, and you can even use it on damp concrete as long as the rain or other water source has been stopped for at least an hour.

You’ll need a caulk gun to squeeze the thick substance into the crack; the 10.1-ounce tube fits most caulk guns. Once you’ve filled the crack, the sealant will self-level to create an even surface, so you won’t need to scrape or sand away a rounded or humped-up edge. And it’s waterproof and resistant to shrinking or cracking.

It dries to a light gray that matches the concrete color, but you can paint or stain it once it’s cured if you prefer another color. You can sand it as well, if necessary.

Note that this is only for sealing cracks on horizontal surfaces, such as garage floors, driveways, walkways, or patios. It is not for use on vertical surfaces, meaning you cannot use it for cracks in walls, stair risers, or for cracks on horizontal surfaces that are sloped.

Like other self-leveling sealants, it is fairly runny at first, so go slow and steady while applying it to avoid overfilling the crack. If you have a lot of cracks to fill, you can also buy this sealant in a 29-ounce tube.

_{Size: 10.1 ounces | Cure Time: 3 to 5 days | Application Method: Caulk gun}

This 100-percent epoxy concrete repair patch is stronger than concrete once it dries. It bonds completely to the concrete and won’t wear down, shrink, or crack over time. It’s perfect for repairing tough cracks or holes up to .5-inch deep in concrete garage floors, foundations, driveways, or walkways, walls, and stairs.

It dries fast, too—if applied on a day when the weather is around 70 degrees and 50 percent humidity, it cures in just eight hours to a concrete-gray color. After that, it’s ready for you to paint or sand it, if desired.

Once dry, it’s not affected by weather and is impervious to vehicle traffic. While more expensive than our other options, this is one of the most durable patch products you’ll find.

Using the product is a little more complicated than a ready-to-go patch, but the results are worth it. This is a two-part product that you’ll need to mix right before use. But don’t worry, no chemistry degree is required: Simply follow the directions to mix two parts of the base with one part of the activator until the consistency is similar to putty.

Then, use a trowel or putty knife to fill in the damaged area within 30 minutes of mixing the product. If filling in a large crack or hole, you may need two applications, each no more than .5 inches thick, but you’ll need to wait a couple of hours between applications, meaning that you’ll need to mix more product for the second layer. One 24-ounce box covers up to 14 linear feet.

_{Size: 24 ounces | Cure Time: 8 hours | Application Method: Trowel, putty knife}

If you need to fill cracks that are no more than .5 inches thick, and you want the convenience of a self-leveling product that easily flows right out of the squeeze bottle, you’ll love this latex-based product from DAP. No caulk gun or putty knife is required, and when properly applied, the crack filler is dry and ready for traffic in just 30 to 45 minutes.

Shake it very well before use—it will flow even better if you set the bottle in a bath of warm water for 10 minutes before using it—and then fill horizontal cracks on driveways, basement floors, concrete steps, walkways, and other flat surfaces. It dries to a concrete gray color but can be painted once it’s dry if you’d like.

Because it self-levels, this isn’t the right product for cracks in vertical surfaces, such as walls or stair risers; used in these situations, it will slump or run. Be careful when snipping off the tip of the squeeze bottle; however, a hole that is too big will allow the sealer to flow too quickly, and a hole that is too small will keep it from flowing smoothly. The 32-ounce bottle will cover roughly 90 linear feet.

_{Size: 32 ounces | Cure Time: 30 minutes | Application Method: Squeeze bottle}

This comprehensive kit from RadonSeal lets you fix cracks in your home’s foundation or basement walls up to .5 inches thick. It seals out moisture—even leaks—as well as dust, insects, mold spores, and harmful gases like radon. 

The kit contains everything you need except for a standard caulking gun. Once cured, your repair will be permanent, waterproof, and flexible enough to resist cracking, shrinking, or splitting.

While the process seems a bit complex, it’s well within the range of the average DIYer. The company also has helpful videos demonstrating the entire process on its website, although the written instructions will likely be all you’ll need.

You will use the kit’s contents to clean the crack, insert the injection ports, mix the ingredients, and then inject the sealant. Once inside the crack, the polyurethane foam forcefully expands to fill every bit of the crack.

Within a couple of hours, the sealer is set enough to repel water and prevent leaks, and it is fully cured within 24 hours. The kit contains enough ingredients to fill up to 10 feet of cracks.

_{Size: 10 feet | Cure Time: 24 hours | Application Method: Caulk gun}

If you have large cracks or areas of spalling, peeling, or flaking of concrete on concrete or masonry, then this easy-to-use acrylic-based patch makes it easy to fix them. It’s ready to go; no need for mixing or stirring. Just apply with a trowel until you’ve filled the gap.

Note that for cracks deeper than .25 inches, you will need to apply the product in multiple layers, each no more than .25 inches, waiting for the full cure time of 24 hours between each layer. It dries to a slightly textured finish that blends in very well with concrete or mortar between bricks. Once cured, it can be painted if desired.

While you can use this to patch vertical and horizontal cracks and holes in masonry and concrete indoors and outdoors, it is not for use on areas that are driven on by vehicles, such as driveways or garage floors. It’s ideal for fixing cracked concrete stairs, walls, sidewalks, masonry walls, and similar surfaces, though.

It cleans up with water, as long as you act quickly before it sets, and it won’t shrink or crack once dry. While it holds up very well to normal weather conditions, it is not waterproof, however. A 1-quart container will cover up to 20 square feet, and a 1-gallon container can cover up to 80 square feet.

_{Size: 1 quart | Cure Time: 24 hours | Application Method: Trowel, putty knife}

This highly effective crack sealer from Sika can be used to permanently repair cracks as wide as 1 inch across. You’ll need a caulk gun to apply it, but this polyurethane product will self-level as it dries, so you won’t need to do much sanding or smoothing after application. Even better, it dries with a slightly textured surface that blends in well with the nearby concrete, so your repair won’t be too obvious.

Since the polyurethane remains slightly flexible, it “moves” with the crack, so temperature extremes, soil settling, or automobile traffic won’t cause it to loosen, crack, or pull away from the repaired spot. You can apply it even to concrete that’s wet, as long as the water is no longer flowing, or use it on newly poured concrete a day later.

You can paint the sealer once completely cured, generally within three to five days, although it will be fairly dry within just a couple of hours. You can also drive over it once cured.

Once dry, it forms a watertight seal, so rain, snow, or runoff from nearby sprinklers won’t penetrate it. It can tolerate temperature extremes from 40 below zero to 170 degrees. However, it’s best used only for horizontal cracks.

_{Size: 10.1 ounces | Cure Time: 3 to 5 days | Application Method: Caulk gun}

The silicone in this sealant dries to a slightly flexible, waterproof seal that keeps out rain, ice, and humidity to prevent moisture damage or crack expansion in concrete that’s often exposed to water. With a caulk gun, you can apply it to cracks up to .5 inches wide in concrete floors, walls, foundations, walkways, and other concrete structures. Because it has excellent adhesion to most other construction materials, it’s also a good choice for filling in small gaps between concrete flooring and nearby structures, such as stucco walls.

You can use this to fill both vertical and horizontal cracks. Once dry, its watertight seal even resists stains and damage from gasoline, oil, grease, or salt, and it won’t crack or bubble.

It can be painted after a 2-hour drying time, but it should be allowed to cure for a full day before direct exposure to water. It can take up to two weeks for a full cure, however.

After applying it, use a damp putty knife or trowel to smooth over the surface of the sealer for an even finish. The sealant dries to a very light gray. Note that it is not for continuous submerged use, such as filling cracks in a swimming pool or at the bottom of a bird bath.

_{Size: 10.1 ounces | Cure Time: Up to two weeks | Application Method: Caulk gun}

Not only does this hydraulic cement start to cure in just three to five minutes, but it can also seal even active leaks or be used to repair submerged cracks in swimming pools or birdbaths. You can use it to patch cracks and holes in concrete, mortar, or masonry surfaces, both horizontal and vertical.

Due to the fast cure time, you do need to work quickly. You’ll also need to mix this product in a ratio of three parts Fast Plug to one part water. Be sure to mix it immediately before you plan to use it, and don’t mix more than you will use within three minutes.

Once mixed, work the product into cracks or holes with a trowel or putty knife. Smooth it over as you work for an even finish.

While the hydraulic cement will be dry enough to hold back leaks within minutes, you’ll need to wait up to an hour before walking on it, and at least a full day before driving over it. It’s very hard and durable once it’s cured.

While it dries to a concrete gray, you can paint over it with waterproofing latex paint once it’s fully set. Note that Fast Plug is best for cracks and holes that are fairly large, not for hairline cracks.

_{Size: 4 pounds | Cure Time: 3 to 5 minutes | Application Method: Trowel, putty knife}

This unique, contractor-grade product is basically a “rope” made of thermoplastic rubber that you pack into .25-inch to .5-inch wide cracks in your concrete or asphalt driveway and then blast with a heat gun or propane torch. The Pli-Stix melts within the crack, creating a watertight seal that’s self-leveling, permanent, and flexible enough to slightly give with temperature-caused expansion and contraction of the concrete.

It bonds very tightly to the concrete, so you can expect it to last for years. That justifies its price, which is higher than many other crack-repair products. Before applying the product, be sure to thoroughly clear any loose debris, dirt, or bits of concrete out of the crack, and only use the Pli-Stix when the ground is dry.

You might need to use a screwdriver or another object to wedge it into the crack. If the crack is very thin, you can cut the filler to fit as necessary.

Once in place, apply direct heat from a propane torch or heat gun to the Pli-Stix until it completely liquefies, which usually takes only 20 to 30 seconds. It sets very quickly; you can usually drive over it within 20 minutes, as long as the weather isn’t too humid.

On the downside, it’s only available in black, so the repaired crack will show on gray concrete. One roll of the product can repair up to 60 feet of cracks.

_{Size: 60 feet | Cure Time: 20 minutes | Application Method: Torch, heat gun}

Self-leveling sealers apply thin enough to spread out in the crack evenly, thus removing the need for you to smooth the filler out yourself with a putty knife, which makes your job easier and faster. This commercial-grade sealant from Quikrete fills in cracks up to 1 inch wide on any horizontal, flat surface, including driveways, garage floors, walkways, patios, and stoops. It’s ideal for areas that receive a lot of vehicle or foot traffic and remains just flexible enough once cured to resist cracking or shrinking due to temperature extremes.

Like other self-leveling products, it should not be used on a sloped or vertical surface, as it will run or slump under those circumstances. While weather-resistant, it is not waterproof.

You apply this sealer with a caulk gun. Be sure the crack is dry and free from debris and dirt before filling it. If the crack is deep, you might need to use two thin applications to completely fill it, waiting at least 24 hours between applications.

Once applied, the sealer begins to set within a few hours. However, it is not fully cured for up to seven days, depending on the weather and the size of the filled crack. It dries to a concrete gray color, but can be painted with a water-based paint once fully cured if desired.

_{Size: 10 ounces | Cure Time: 7 days | Application Method: Caulk gun}

This water-based product can stretch up to 300 percent of the crack’s size without shrinking, cracking, pulling loose, or lifting. It even remains stable through freeze/thaw cycles. It’s a good product for cracked concrete exposed to extreme weather conditions, which are typically difficult to repair, as the concrete will slightly expand during high temperatures and contract during cold weather.

This tends to crack or displace crack fillers that dry very hard. The solution for these areas is a crack repair product (like this one) that remains just a bit flexible once dry, thus allowing the filler to expand and contract along with the concrete to improve its durability.

You can use this to fill cracks up to 3 inches in width on horizontal surfaces, including those that receive vehicle traffic. While the sealant dries without slumping, it is not truly self-leveling, so you might need to smooth it with a putty knife after applying it. It’s fairly easy to apply with a caulk gun, as long as you don’t try to go too fast.

While the sealant is dry to the touch within a few hours, you should not walk or drive over the repaired crack for at least a full day. It can take up to a week or more to fully cure, though. Once cured, you can paint over the gray color if desired.

_{Size: 10.5 ounces | Cure Time: 1 week | Application Method: Caulk gun}

This flexible product from Bluestar is the answer for very thin cracks no more than 0.125 inches wide. Squeeze it carefully into the crack; the thin spout of the squeeze bottle lets you get right in there, and the fairly thin consistency of the sealant allows it to run down into the gap easily.

It’s not self-leveling, so you might need to smooth off the surface with a putty knife to give the best finished appearance. Once dry, the filler seals the crack so moisture can’t continue to enlarge it, and it’s flexible enough to give slightly with ground movement or expansion/contraction of the concrete to resist splitting, lifting, or cracking.

The cure time is 24 hours in good weather, longer if it is very humid or cold. It should be applied to dry concrete and on horizontal cracks only. The thinness of this product makes it unsuitable for cracks on walls or other vertical surfaces or for use on slopes where it’s likely to run.

After it’s fully cured, it can be used on driveways or garage floors with vehicle traffic. You can also paint it if you don’t like its gray color.

_{Size: 8 ounces | Cure Time: 24 hours | Application Method: Squeeze bottle}