How to Fix Peeling Sealer on Concrete?

Concrete is a popular and durable material used in various construction projects, known for it’s strength and longevity. However, despite it’s resilience, concrete can still be prone to certain issues, and one common problem is peeling sealer. So, how can one fix this peeling sealer on concrete? While there are several methods and products available, one effective solution is to use Xylene or a citrus stripper. By turning off all gas and heat sources, and then applying these substances onto the affected areas, the peeling sealer can be softened. Allow the solution to sit and penetrate the sealer until it becomes softened and re-liquifies. To ensure comprehensive coverage, apply more Xylene or stripper and scrub the sealer gently using a stiff straw scrub brush on a broom handle.

Why Is My Concrete Sealer Peeling?

Peeling sealer on concrete is a common problem that many people face. The main reason why this happens is due to inadequate preparation or a weak concrete surface. Additionally, if the concrete surface is weak or has underlying issues like moisture or a high pH level, it can also cause the sealer to peel off.

Before applying any sealer, it’s crucial to thoroughly clean the concrete to remove dirt, oil, and any other contaminants.

If the concrete is old, damaged, or has low strength, it may not provide a stable base for the sealer to adhere to.

Moisture-related issues can also lead to peeling sealer. Similarly, if there’s a high pH level in the concrete, it can have a negative impact on the sealers adhesion and result in peeling.

Start by thoroughly cleaning the concrete surface to remove any dirt, oil, or other contaminants. If there are any weak or damaged areas, repair them before reapplying the sealer. It’s also crucial to ensure that the concrete is properly dried and has a suitable pH level. Finally, choose a high-quality sealer that’s compatible with the concrete type and follow the manufacturers instructions for application.

Proper cleaning, repairing any damages, and ensuring suitable moisture levels and pH are crucial for fixing and preventing peeling sealer. By addressing these factors and using a high-quality sealer, you can maintain a durable and long-lasting seal on your concrete surfaces.

How to Properly Clean Concrete Before Applying a Sealer

  • Mix a solution of water and degreasing cleaner.
  • Apply the solution to the concrete surface.
  • Scrub the surface using a push broom or a stiff brush.
  • Rinse the concrete with clean water.
  • Remove any remaining dirt or stains using a pressure washer.
  • Allow the concrete to dry completely.
  • Once dry, apply a concrete sealer according to the manufacturer’s instructions.

When it comes to reapplying concrete sealer, the first step is to determine whether the previous sealer needs to be removed or not. Acid etching or grinding is necessary to eliminate any remnants if the previous sealer is incompatible. However, if the previous sealer is compatible, it may be possible to reseal without removing it. Certain solvent-based acrylic concrete sealers can be applied over previous solvent-based acrylics, simplifying the resealing process.

Can You Reapply Concrete Sealer?

When it comes to fixing peeling sealer on concrete, the first step is to determine whether you can simply reapply a new layer of sealer or if you need to remove the previous sealer altogether. If the previous sealer has been used and is compatible with the new sealer you want to apply, you may be able to reseal without the need for removal.

This can be done through acid etching or grinding, depending on the type of sealer used.

Acid etching involves applying an acid-based solution to the concrete surface to strip away the previous sealer. This process requires careful handling and protective gear, so it’s recommended to hire a professional if you aren’t experienced with acid etching.

Grinding, on the other hand, involves using a mechanical grinder to remove the previous sealer. This method is typically faster and more efficient, but it may create a lot of dust, so proper ventilation and dust control measures should be in place.

This may involve cleaning, repairing any cracks or damages, and ensuring the surface is smooth and free of debris.

If you want to reapply concrete sealer but there’s a previously applied sealer, it’s crucial to evaluate it’s compatibility with the new sealer. If it’s compatible, you may be able to proceed without removing the previous sealer. Remember to also prepare the concrete surface properly before applying the new sealer for better results.

Source: Can You Seal Old Concrete

To fix a bad concrete seal job, start by examining the back of the flaking sealer for debris or concrete particles. Remove any flaky material by using a high pressure washer or vigorous scrubbing. After thoroughly drying the surface, apply two diluted coats of sealer followed by a straight coat for optimal results.

How Do You Fix a Bad Concrete Seal Job?

When it comes to fixing a bad concrete seal job, one of the first steps is to carefully examine the area where the sealer is peeling. This can provide important clues as to the underlying cause of the problem. As you inspect the back of the flaking sealer, take note of any debris or concrete particles that may be present.

If you find that there’s debris or concrete particles on the back of the sealer, it’s important to remove these before attempting to fix the issue. This can be done by using a high pressure washer to blast away the flaky material. Alternatively, vigorous scrubbing with a stiff bristle brush may also be effective in removing the debris.

Once you’ve thoroughly cleaned the area and it’s dry, it’s time to proceed with fixing the bad sealer job. One possible solution is to apply two diluted coats of sealer to the affected area. Diluting the sealer with water can help improve it’s absorption and adhesion to the concrete surface. After applying the diluted coats, follow up with a straight coat of sealer for added protection.

It’s important to note that the specific type of sealer you use can play a role in the durability and effectiveness of the fix. Be sure to choose a high-quality sealer that’s suitable for your specific concrete surface.

In addition to fixing the immediate problem, it’s also important to address any underlying issues that may have caused the sealer to peel in the first place. This could include inadequate surface preparation, improper application techniques, or even the use of an incompatible or low-quality sealer. By identifying and resolving these issues, you can help prevent future problems and ensure a longer-lasting seal on your concrete surface.

With proper care and maintenance, your concrete surface can regain it’s original beauty and protection.

How to Choose a High-Quality Sealer for Concrete

  • Check for VOC content: Volatile Organic Compounds (VOCs) are harmful chemicals found in many sealers. Choose a sealer with low or zero VOC content to protect your health and the environment.
  • Consider the sealer type: There are two main types of concrete sealers – penetrating and surface sealers. Penetrating sealers are absorbed into the concrete, providing long-lasting protection. Surface sealers form a protective layer on top of the concrete. Decide which type suits your needs best.
  • Assess the durability: Look for a sealer that offers excellent durability and can withstand heavy foot traffic, UV rays, freeze-thaw cycles, and other environmental factors.
  • Check for water resistance: Concrete sealers should provide water repellence to prevent damage from moisture, stains, and mold growth.
  • Consider color enhancement: Some sealers offer color enhancement, which can enhance the natural color of the concrete or add a tint. Decide if you want to enhance the appearance of your concrete surface.
  • Evaluate the ease of application: Choose a sealer that’s easy to apply and doesn’t require complex techniques or professional assistance.
  • Look for UV protection: UV rays can cause fading and discoloration to the concrete surface. Opt for a sealer with UV protection to maintain the appearance of your concrete for longer.
  • Consider maintenance requirements: Some sealers may require periodic reapplication or additional maintenance. Assess if you’re willing to invest time and effort into maintenance.
  • Read product reviews: Lastly, read reviews and testimonials from other users to gauge the performance and quality of the sealer you’re considering.

When it comes to applying sealer on top of an existing sealer coating, it all depends on the type of sealer used in the first application. If a solvent-based sealer was initially used, then another layer of solvent-based sealer can be applied. However, if a water-based sealer was previously used, it isn’t recommended to apply a solvent-based sealer on top.

Can You Apply Sealer on Top of a Sealer Coating?

Applying sealer on top of a sealer coating can be a bit complicated, depending on the type of sealer you’re using. In most cases, it’s possible to apply a new solvent-based concrete sealer on top of an existing solvent-based sealer coating. This is because solvent-based sealers tend to be compatible with each other, allowing for a successful application.

However, things get a bit trickier when you’re dealing with water-based sealers. Water-based sealers don’t always adhere well to surfaces previously sealed with solvent-based sealers. The water-based sealer may not properly bond to the surface, resulting in peeling, blistering, or an overall failed application.

To avoid these issues, it’s important to properly prepare the surface before applying a new sealer. This typically involves thoroughly cleaning and stripping the existing sealer, especially if it’s a different type than the one you plan to apply. This can be done using a combination of chemical strippers, pressure washing, and mechanical abrasion.

It’s crucial to follow the manufacturers instructions and recommendations for the specific sealer you’re using. This includes proper application techniques, drying times, and any priming or conditioning steps that may be required.

Proper surface preparation is key to ensure a successful application and prevent issues such as peeling or blistering.

How to Properly Clean and Strip Existing Sealer Before Applying a New One

Before applying a new sealer on concrete, it’s important to properly clean and strip the existing sealer. Start by removing any loose or peeling sealer using a scraper or putty knife. Next, use a degreaser or cleaner specifically designed for concrete to remove any dirt, grease, or stains. Scrub the surface thoroughly, paying attention to any stubborn areas. Rinse the concrete with clean water and allow it to dry completely. Once the surface is dry, you can apply a new sealer according to the manufacturer’s instructions. This preparation process will ensure a smooth and long-lasting application of the new sealer.

When applying concrete sealer, it’s recommended to use two thin coats for optimal results. The first coat serves as a primer and may not visibly cover the surface entirely. However, the second coat will provide the desired finish, enhancing the color and adding a glossy appearance.

How Many Coats of Concrete Sealer Is Needed?

When it comes to fixing peeling sealer on concrete, it’s essential to understand the proper application technique. One crucial aspect to consider is the number of coats needed for optimal results. Concrete sealers are typically best applied in two thin coats rather than one thick coat.

The first coat of sealer acts as a primer, penetrating the concrete surface and preparing it for the final finish. During this initial application, you may notice that most of the sealer disappears into the concrete, leaving the surface looking less than attractive. However, this is a normal occurrence and doesn’t indicate an issue with the sealer.

After allowing sufficient time for the first coat to dry, you can proceed with applying the second thin coat. This second layer will provide a more even finish, enhance the concretes color, and add a glossy appearance. It’s crucial to ensure that the second coat is applied evenly, as this will greatly affect the overall appearance and durability of the sealer.

Applying an additional coat won’t only address any peeling issues but also provide better protection and longevity. It’s important to note that using one thick coat instead of two thin coats can result in uneven finishes, inadequate adhesion, and an overall unsatisfactory outcome.

The first coat serves as a primer, while the second coat provides an even finish, color enhancement, and a glossy appearance. Applying the sealer in this manner ensures proper adhesion and a long-lasting protective layer. Remember to allow sufficient drying time between coats and follow the manufacturers instructions for the best results.

Choosing the Right Type of Concrete Sealer for Your Specific Project

When it comes to fixing peeling sealer on concrete, selecting the correct type of concrete sealer is crucial for a successful repair. Different projects call for different sealers, and using the right one will ensure optimal results.

First, consider the type of sealer you need. There are two main categories: film-forming sealers and penetrating sealers. Film-forming sealers create a protective layer on the concrete’s surface, offering excellent protection against water, chemicals, and UV damage. On the other hand, penetrating sealers penetrate the concrete, providing long-lasting protection without altering the appearance.

Next, evaluate the condition of your concrete. If the sealer is peeling due to moisture issues, a breathable sealer like a penetrating sealer is recommended. This type will allow moisture to escape from the concrete, preventing further peeling. For surface-level peeling caused by wear and tear, a film-forming sealer can effectively bond to the concrete and prevent future damage.

Additionally, factor in the desired appearance. Film-forming sealers come in various finishes, such as gloss, semi-gloss, and matte, allowing you to choose the look you prefer. Penetrating sealers, on the other hand, leave the concrete’s natural appearance unaffected.

Lastly, always follow the manufacturer’s instructions when applying the sealer. Proper surface preparation, application techniques, and curing times are crucial for a successful outcome.

By selecting the right type of concrete sealer based on your project’s requirements and condition, you can effectively fix peeling sealer and ensure the longevity and durability of your concrete surface.


To fix a flaking sealer effectively, it’s important to prioritize safety by turning off all gas and heat sources in the surrounding area. From there, utilizing Xylene or a citrus stripper is crucial, as it helps to soften the sealer. Once softened, applying more Xylene or stripper and utilizing a stiff straw scrub brush on a broom handle will help to break down and re-liquify the sealer, ultimately resolving the issue. By following these steps carefully, you can ensure a successful restoration of your concrete surface and restore it’s visual appeal.

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