Concrete happens to be one of the most durable and strongest construction materials. If it is cured properly, it resists cracks for a long time. But sometimes, that doesn’t happen and cracks end up forming on its surface.
As a homeowner, this can be very disturbing. To make the matters worse, getting a permanent solution to repair those cracks is not easy at all. And seeing that you’re reading this article, we’re certain you agree that, right?
Well, then we suggest you try out using the best concrete caulk. Whether you want to repair cracks in various concrete surfaces including walls and floors, it will work for you!
That is not even the best part! Caulks, also known as sealants, helps you get rid of those cracks in less time. It’s simply a less adhesive and dry compound that repairs cracks by filling them.
In this guide, you’ll find sealants and caulks that will help you repair your concrete surface. Continue reading to determine the caulk that perfectly fits your concrete repair needs! Now, let’s do this!
6 Best Concrete Caulk Reviews
1. Red Devil Masonry & Concrete Acrylic Sealant Repair
Talk about a caulk that is specifically designed for repairing cracks in concrete! Well, that’s exactly what this sealant from Red Devil offers.
It’s available in a 300ml squeezable tube and weighs 15 ounces, making it extremely easy to handle. Moving on to the acrylic compounds, its unique formula provides outstanding durability. For that, it doesn’t chip, crack, or peel when exposed to external elements.
Furthermore, this caulk has remarkable water resistance. Even so, we recommend that you use it in areas with little or no water contact. This is because acrylic doesn’t prevent water as well as silicone.
Another good thing about this sealant is that it’s ideal for outdoor applications since it doesn’t get discolored or stains. Also, it’s paintable, meaning you can choose a color that matches the concrete surface after application. However, its color is slightly gray which blends well with the mortar. As for the finish, it is textured, yet smooth and elegant.
Apart from masonry and concrete, it works on other surfaces like wood, stucco, cinder block, and brick.
Once you’re done applying this concrete caulk, you can easily clean up the mess with water. One thing you should note about this product, though, is that it takes 6 days to cure fully. Other than that, it repairs various concrete-related issues efficiently!
- Water clean-up
- Durable, waterproof, and weather-resistant
- Textured finish
- Doesn’t cure fast
2. Loctite PL Polyurethane Sealant
If you notice any horizontal crack on your concrete floor, we suggest you try out this Loctite Self Levelling sealant! All thanks to its amazing features. What are these properties? Well, let’s look at them one by one!
For one, the polyurethane-rich formula is a great building material. This is because it ensures the sealant offers immense longevity and durability. The caulk also has excellent abrasion and tear resistance property. Therefore, it will not peel, crack, or chip, even when subjected to external factors. As such, regardless of where you live, this sealant will perform well. Not to forget that it’s very flexible as it’s not affected by concrete expansion and contraction.
Regarding the packaging, the caulk comes in a 295 ml tube that is simple to handle. Besides, after application, it remains firmly stuck to the surface, keeping the crack repair intact. In addition to concrete, its adhesion is compatible with other surfaces like metal, wood, and stone.
Amazing features, right? You’ll be surprised to know that they’re not even this product’s most brilliant property! That title is reserved for the self-leveling feature! This means that the caulks settles itself automatically after applications, giving you a smooth and uniform surface.
Moreover, you can accurately match the repaired part with the surrounding since this caulk is paintable. Note: This caulk is not ideal for repairing vertical cracks because of its liquid consistency.
- Strong adhesion
- Durable and flexible
- Not ideal for vertical cracks
- Long curing time
3. Sashco Slab Concrete Crack Repair Sealant
Established in 1936, the founder of the Sashco Slab Company aimed to provide solutions for problems that seemed unsolvable. And over the years, the company has developed some amazing caulk compounds. With their best caulk for concrete cracks being this Slab Sealant!
You’ll find it very useful in various applications. From the major cracks in a construction project to the little cracks in your home pavement, there is nothing this sealant can’t handle!
The best property about this sealant is that it has great adhesion. While it might take a long time to dry, once it does, your concrete will be free of cracks for years! It also prevents moisture from seeping through the cracks, hence increasing the concrete’s lifespan.
The caulk comes in 10.5 fl. oz. convenient bottle. To use apply the compound, just squeeze the bottle and it will easily come out of the narrow nozzle. That simple! It’s designed to fill cracks with a width of up to 3 inches. However, to work on short-length and long-length cracks quickly, we suggest you use a caulk gun.
Once this compound dries, its color turns to light gray that blends well with the concrete surface. Also, if the surrounding surface is painted, you can sand and paint the dried compound as well.
- Excellent adhesion
- Durable and waterproof
- Universal color
- Easy application
- A little expensive
- Takes a long time to dry
4. General Electric Concrete & Masonry Silicone II Caulk
General Electric Sealants and Adhesives is a very popular brand in the silicone technology world. They have an innovative and committed approach that helps them to manufacturer various premium products for the construction industry. Now, that’s where this Generic Electric Silicone II Caulk lies!
What so special about this caulk? That’s probably the fact that it’s among the few sealants that become water-resistant, shortly after application. Therefore, if it’s about to rains, don’t delay your concrete sealing plans as this caulk has got you covered!
Unlike most caulks, it takes about 3 hours only to dry and build a strong adhesion. And as you know, most concrete cracks sealants out there dry fully in about 24 hours. So, having GE 5020 will help you save time and increase the efficiency and speed of the task.
Even better, this caulk is not just resistant to water! Instead, it can withstand almost all harsh weather conditions including high and low temperatures. Also, it has permanent flexibility that prevents its quality from degrading when subjected to continuous freeze & thaw. Besides, it protects concrete cracks from mold since it doesn’t leave any space to promote their growth.
One thing about this sealant, though, is that it’s not paintable. But since its gray color blends perfectly with most concrete surfaces, we hope that won’t be an issue.
- Fast drying time
- Permanent flexibility
- Universal & beautiful light gray color
- It’s non-paintable
5. Dap Self-Leveling Concrete Sealant
When caulking, some people find it extremely hard to level it before it’s completely dry. And, if the caulk dries non-uniformly, it can form lumps that look ugly.
No one wants that, right?
Besides, fast caulk leveling requires a lot of skills and practice.
So, imagine how daunting the task will be for unskilled people and beginners. Luckily, with a self-leveling sealant from Dap, that doesn’t have to be the case anymore as it becomes uniform automatically after application.
Being one of the best caulk-producing companies, DAP has introduced various great products in the market, including this concrete sealant.
Why choose it over other caulks? Well, here are some of its amazing features!
Firstly, this caulk is made up of superior silicone rubber that guarantees durability and efficient results. It is available in a convenient squeezable bottle and comes out in a semi-liquid form with a gray tint. Although some people don’t like this color, you’ll be glad to know that it’s paintable.
Secondly, its formula has a low odor that isn’t easily noticeable. It’s also weather-resistant, meaning it’s doesn’t contact or shrink because of environmental aspects.
Furthermore, this caulk is made with KWIK Dry Technology, allowing it to dry after only three hours. Not to forget that it’s also waterproof, which protects mold and bacterial build-up on the surface. Therefore, in addition to concrete, you can use it in other areas like the kitchen and bathroom.
- Waterproof and weather-resistant
- Low odor
- Paintable, flexible and durable
- Not ideal for vertical cracks
6. Bluestar Flexible Concrete Crack Filler
Concrete cracks are not always big, with some even being less than 1” wide. But, you should not underestimate a crack because of its size. Indeed, it’s these small cracks that eventually turn into something big. And that’s exactly where a product like this Bluestar Concrete Crack Filler comes in. Moreover, apart from sealing cracks, this filler protects the surface from rainwater.
Considering that this filler is designed for small cracks, it’s very simple to apply. It comes in a squeeze bottle with a narrow tip that minimizes the mess when filling cracks on the surface.
As such, you don’t need any complicated tools during the application process. This also makes it one of the best caulk for concrete cracks, especially for beginners. However, avoid using it on vertical surfaces because it has a runny texture.
Another good thing about this filler is that it works in both cold and hot weather. Thanks to its flexibility that enables it to adjust itself to the concrete’s natural contraction and expansion in different weather conditions.
After application, the filler dries into a paintable, light gray finish. However, you can also choose the gray shade, depending on your concrete surface’s original color.
- Perfect for beginners
- Fills concrete cracks of up to 1” width
- Available in light gray & gray shades
- Choosing the wrong shade makes the surface look peculiar
Best Concrete Caulk Buying Guide
Caulks are small items needed for small concrete repairs. But don’t let that make you think that there are no features or qualities to consider when making a buying decision. To demonstrates that, here are some factors you should always look for in a concrete caulk:
The less time a caulk takes to dry and cure, the more convenient it’s for you. Most concrete caulk out there takes around 24 hours to dry, while others can take as less as 3 hours. So, when buying concrete sealants or caulks, remember that different products have different curing times.
Concrete naturally contacts and expands because of temperature variation. So, once you fill the crack, the concrete will still have these characteristics. For that reason, you should choose a flexible crack sealant to help it resists concrete’s contraction and expansion.
Different types of concrete caulk work well on different-size cracks. Some are designed for deep, wide cracks, while others work well for hairline cracks. Furthermore, these crack sealants have varying consistency. Therefore, you’ll notice that crack fillers for narrow and hairline cracks come in bottles with thin nozzles or tubes for easy application.
Types of Caulk for concrete
There are many different types of concrete caulks, with each of them having a unique purpose. The most common types are;
1. Repair Caulk
This type of caulk has a latex-based composition. The main thing that differentiates it from crack sealant, is that it works on both horizontal and vertical surfaces.
2. Crack Sealant
Crack sealants are mainly designed to repair and fill up thin cracks that are less than ½” wide. Also, because of their consistency, they’re only applied on horizontal surfaces. They usually come in a bottle with a pinpointed tip for convenient application. Another notable feature about sealants is that they’re self-leveling.
3. Patching compound
Patching compounds come in both a dry cement powder and a pre-mixed form. They’re specifically designed for shallow cracks and their application process is the same as using regular cement. Therefore, you need a trowel to help you fill and smooth it over the cracked part.
4. Hydraulic Cement
Just by looking at the name, you can easily tell that this type of caulks is designed to seal leaking concrete cracks. Therefore, it has a quick curing time. It comes in a powder form, meaning you have to mix it with water to create a flexible dough to apply. You can use it to repair cracks on both horizontal and vertical cracks.
5. Quick-setting cement
The other common type of concrete caulk is quick-setting cement. A filler that is designed to repair 0.5 to 1” wide cracks. Since this cement comes in a powder form, you need to mix it with water to create a paste. Sometimes you need to add a bonding liquid that helps to slow down the setting time. This also makes the repair durable and stronger.
Frequently Answer Questions
1. How do you apply concrete caulk?
Start by cleaning the cracked part to remove any dirt inside it. Then take your sealant and shake it well to mix the ingredients thoroughly. After that, open the nozzle, place it on the crack and squeeze the bottle/ tube gently until the crack is well filled. You can now leave the caulk to dry!
2. Can you remove caulk from the surface after it has dried?
Yes. The easiest way is to use a chisel or grinding tool. Gently put the chisel’s tip against the caulk you want to remove, then tap it using a hammer and continue doing that along the cracked area.
3. What is the drying time of concrete caulk?
The drying time of caulks varies depending on the size and depth of the crack and the product type being used. For instance, concrete crack fillers take about 24 hours to dry. Therefore, you must protect it from water until it’s completely dry. However, they are some caulks that dry in about 3 hours.
4. Which is the most flexible concrete caulk?
Caulks that are made from polyurethane are considered to be the most flexible. They’re also the easiest to use and you can even twist, bend and elongate them more than other caulks. Another benefit is that they’re compatible with most surfaces and more durable. On the downside, they’re more costly.
5. What is used to make concrete caulks?
Most caulks in the market today are made from silicone, acrylic, or latex. However, some products are made from a combination of these ingredients.
When it comes to weather-proofing or making repairs around your home, having a concrete caulk comes in handy. Especially since you just need one application to get rid of concrete cracks completely.
That’s why we’ve decided to step in and help you choose the best concrete caulk out there. Always remember, the best product is the one that matches your requirements, needs, and budget. With that, you’ll easily find a concrete sealant that will make your house more comfortable!