Does Flex Seal Work On Concrete

Are you tired of dealing with cracks, leaks, and other issues on your concrete surfaces? If so, you may have heard about Flex Seal, a popular sealant that claims to fix almost anything.

But does Flex Seal really work on concrete? In this article, we’ll explore the science behind Flex Seal and its effectiveness on concrete surfaces, as well as provide tips for maximizing its effectiveness and alternative options to consider.

First, let’s understand how Flex Seal works. This sealant is made of a liquid rubber that dries into a flexible, waterproof coating. It’s designed to seal cracks, leaks, and other imperfections on various surfaces, including concrete.

The manufacturer claims that Flex Seal can withstand extreme temperatures, water pressure, and other environmental factors, making it a versatile solution for many homeowners and contractors. But does it really live up to the hype? Let’s find out.

Understanding the Science behind Flex Seal

Let’s dive into the nitty-gritty of how this popular product can help patch up those frustrating cracks in your driveway. Flex Seal is a liquid rubber sealant that creates a waterproof barrier when applied to surfaces. It works by seeping into cracks and holes and forming a strong, flexible seal that can withstand extreme temperatures and weather conditions.

The secret behind Flex Seal’s effectiveness lies in its unique formula. It’s made up of a thick, rubberized liquid that can be applied with a brush, roller, or spray can. Once it dries, it creates a flexible, rubberized coating that can expand and contract with the surface it’s applied to. This makes it ideal for use on concrete surfaces that are prone to cracking and shifting over time.

When applied correctly, Flex Seal can help prolong the life of your concrete surfaces by preventing water and other elements from seeping in and causing damage. It can also help improve the appearance of your driveway or patio by filling in unsightly cracks and gaps.

So if you’re looking for a reliable solution to your concrete woes, give Flex Seal a try and see the difference it can make.

The Pros and Cons of Using Flex Seal on Concrete

You’ll want to know the advantages and disadvantages of using Flex Seal on your concrete surfaces.

On the plus side, Flex Seal can be a quick and affordable solution for sealing small cracks and leaks in your concrete. It’s easy to apply and dries quickly, so you can have your concrete sealed and protected in no time. Plus, Flex Seal has a strong adhesive quality that can help keep your concrete intact and prevent further damage.

However, there are also some potential downsides to using Flex Seal on concrete. For one, it may not be the most durable solution for larger cracks or areas of heavy wear and tear. Depending on the severity of your concrete damage, you may need a more heavy-duty concrete repair product to get the job done. Additionally, Flex Seal may not be the best choice if you’re looking for a long-term solution, as it may need to be reapplied periodically.

Overall, whether or not Flex Seal is a good choice for your concrete will depend on the specific situation and needs of your surface. While it can be a quick and easy fix for small cracks and leaks, it may not be the most durable or long-lasting option for larger areas of damage.

Before using Flex Seal on your concrete, be sure to assess the extent of the damage and consider all of your repair options.

How to Prepare Your Concrete Surface for Flex Seal

Preparing your concrete surface properly is crucial to ensuring that Flex Seal adheres correctly and provides effective protection against cracks and leaks. Before applying Flex Seal, you should clean the surface thoroughly to remove any dirt, oil, or debris that might prevent it from bonding properly.

Here are some steps to follow:

  • Use a pressure washer or hose to wash away any loose dirt or debris.
  • Scrub the surface with a degreaser or soap to remove any oil or grease stains.
  • Rinse the surface thoroughly and let it dry completely.
  • If there are any cracks or holes in the concrete, fill them with a concrete patching compound and let it dry before applying Flex Seal.
  • Finally, mask off any areas that you don’t want to be coated with Flex Seal, such as nearby walls or windows.

Once you’ve prepared your concrete surface, you’re ready to apply Flex Seal. Remember to shake the can well before using it and apply multiple thin coats rather than one thick coat. This will help ensure that the Flex Seal adheres properly and provides maximum protection against leaks and cracks.

In addition to properly preparing your concrete surface, it’s important to take regular maintenance steps to keep your Flex Seal coating in good condition. Check the surface periodically for any signs of wear or damage, and reapply Flex Seal as needed to keep your concrete protected. With proper preparation and maintenance, Flex Seal can be an effective solution for protecting your concrete surfaces from leaks and cracks.

Applying Flex Seal to Your Concrete Surface

Applying Flex Seal to your concrete surface is a straightforward process that can provide long-lasting protection against cracks and leaks. First, make sure you have a clean and dry surface. Use a pressure washer or a hose to remove any dirt or debris, and let it dry completely before proceeding.

Next, shake the can of Flex Seal well and hold it about 8-12 inches away from the surface. Spray in a sweeping motion, starting from the top and working your way down. Apply multiple coats if needed, waiting at least 24 hours between each coat.

It’s important to note that Flex Seal works best on small cracks and leaks. For larger areas, you may need to use more than one can or consider a different solution. Also, be careful not to overspray or apply too thick of a coat, as this can lead to inconsistent coverage and longer drying times.

After you have applied the desired amount of Flex Seal, let it dry completely before exposing it to any moisture or foot traffic.

Once the Flex Seal has dried, you can enjoy the peace of mind that comes with a protected concrete surface. Whether you used it on your driveway, patio, or basement floor, Flex Seal can help prevent further damage and extend the life of your concrete. So, if you’re tired of dealing with cracks and leaks in your concrete, give Flex Seal a try and see the difference for yourself.

Tips for Maximizing Flex Seal’s Effectiveness on Concrete

To get the most out of it, you should consider these tips when using Flex Seal to protect your concrete surfaces.

First, ensure that the surface is clean and dry before applying Flex Seal. Any dirt, debris, or moisture can compromise the sealant’s effectiveness, so it’s important to thoroughly sweep and dry the area.

Additionally, if there are any cracks or holes in the concrete, it’s essential to fill them in with a concrete patching compound before applying Flex Seal. This will help to create a smooth and even surface for the sealant to adhere to.

Second, apply Flex Seal in thin, even coats. It’s better to apply multiple thin coats than one thick coat, as thick coats can take longer to dry and may not adhere as well. Use a brush or roller to apply the sealant, and make sure to follow the manufacturer’s instructions for drying times and reapplication.

Finally, be patient and allow the sealant to fully dry before using the surface. This can take up to 24 hours, depending on the temperature and humidity. Avoid walking or placing heavy objects on the surface until it’s completely dry, as this can cause the sealant to crack or peel.

With these tips in mind, you can maximize Flex Seal’s effectiveness and provide long-lasting protection for your concrete surfaces.

Alternative Concrete Sealant Options to Consider

Looking for other options to seal your concrete? Check out these alternative products that may suit your needs better.

One popular choice is epoxy. This two-part system creates a strong, durable surface that can resist chemicals, stains, and abrasion. It also adds an attractive glossy finish to your concrete. However, it requires proper preparation and application to ensure a successful outcome.

Another option is silane/siloxane sealers. These products penetrate deeply into the concrete to create a hydrophobic barrier that repels water and other liquids. They are also breathable, allowing moisture to escape from the concrete. This makes them ideal for areas with high humidity or freeze-thaw cycles. They do not change the appearance of the concrete, so they are best for applications where aesthetics are not a concern.

Lastly, you may want to consider penetrating sealers. These products also penetrate deeply into the concrete to create a barrier against moisture and stains. They are easy to apply and can be used on both interior and exterior surfaces. They are also eco-friendly and low-VOC, making them safe to use indoors. However, they do not provide any gloss or sheen and may require reapplication over time.

Real-Life Examples of Flex Seal’s Effectiveness on Concrete

If you want to see real-life examples of how this miracle solution transformed concrete surfaces, keep reading! Flex Seal has become a popular choice for covering up cracks and leaks in concrete structures. In fact, many people have shared their success stories online, showing how Flex Seal can effectively seal concrete surfaces.

One user shared how they used Flex Seal to fix a crack in their concrete pool. They applied the solution directly to the crack and allowed it to dry completely. After a few days, they filled the pool with water and were thrilled to see that the crack was completely sealed.

Another user used Flex Seal to seal a leak in their concrete basement. They applied the solution to the leaky area and waited for it to dry. The result was a completely sealed and dry basement.

Overall, Flex Seal has proven to be an effective solution for sealing concrete surfaces. It can be used on a variety of structures, from pools to basements to driveways. If you’re looking for an easy and affordable solution to fix cracks or leaks in your concrete surfaces, Flex Seal is definitely worth considering. Just make sure to follow the instructions carefully and allow the solution to dry completely before using the surface.

Final Verdict: Is Flex Seal the Right Solution for Your Concrete Problems?

Now that you’ve seen some real-life examples of how Flex Seal can effectively repair concrete, the question remains: is it the right solution for your specific concrete problems?

While Flex Seal can be a great option for small cracks and leaks, it may not be the best choice for larger, structural issues. If you’re dealing with major cracks or damage to your concrete, it’s important to address the root cause of the problem before attempting any repairs.

This may involve consulting a professional contractor or engineer to assess the situation and recommend the appropriate course of action. Ultimately, the decision to use Flex Seal on your concrete will depend on the severity of the damage and your desired outcome.

If you’re looking for a quick and easy fix for minor cracks and leaks, Flex Seal may be a viable option. However, for more serious structural issues, it’s best to seek professional guidance to ensure the safety and integrity of your concrete.


So, does Flex Seal work on concrete? The answer is yes, but it may not be the best solution for every concrete problem you encounter.

While Flex Seal can provide a quick and easy fix for minor cracks and leaks, it may not be as effective for larger issues or for areas experiencing heavy foot traffic or vehicle use.

Before using Flex Seal on your concrete surface, make sure to properly prepare the area and follow the application instructions carefully. And if you’re unsure if Flex Seal is the right solution for your specific concrete problem, consider consulting with a professional for guidance.

Overall, Flex Seal can be a useful tool for maintaining and repairing your concrete surfaces, but it’s important to understand its limitations and to explore alternative sealant options when necessary.