• Sat. May 18th, 2024

How to Tell When Your Concrete Needs Sealing: Warning Signs and Solutions

ByFreya Parker

Jan 4, 2024

Concrete, with its robust and durable nature, is a stalwart in construction. However, even this seemingly invincible material is not immune to the wear and tear inflicted by time and the elements. To maintain the longevity and structural integrity of concrete surfaces, it’s crucial to recognize the warning signs that indicate the need for sealing. In this comprehensive guide, we explore the telltale signals that your concrete requires attention, and we delve into effective solutions to protect and preserve this essential building material.

Recognizing the Warning Signs

Water Absorption and Staining:

One of the earliest signs that your concrete may need sealing is increased water absorption. Unsealed concrete is porous, allowing water, oil, and other liquids to penetrate its surface. If you observe water pooling or noticeable staining after rain or spills, it’s a clear indication that the concrete is absorbing moisture and contaminants. Sealing can mitigate this issue by creating a protective barrier and preventing water and stains from infiltrating the material.

Cracking and Spalling:

Cracks on the surface of concrete can be a visible manifestation of its vulnerability. Freeze-thaw cycles, temperature fluctuations, and other environmental factors contribute to the development of cracks. If left unaddressed, these cracks can lead to more severe issues, like spalling, where portions of the concrete surface begin to break off. Sealing is an effective preventative measure, reducing water ingress and minimizing the impact of temperature-induced expansion and contraction.

Surface Erosion and Dusting:

A concrete surface that appears to be eroding or exhibiting dusting—where loose particles come off easily when touched—is a cause for concern. This can result from abrasion, weathering, or the use of harsh cleaning methods. Sealing provides a protective layer that enhances the surface’s resistance to abrasion and prevents the deterioration that leads to dusting.


Efflorescence, the white, powdery substance that forms on the surface of concrete, is a sign of moisture migration through the material. As water travels through the concrete, it dissolves minerals and deposits them on the surface when it evaporates. Sealing helps prevent efflorescence by reducing water penetration and preserving the aesthetic appeal of the concrete.

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Fading and Discoloration:

UV exposure can cause concrete surfaces to fade and discolor over time. If your concrete was once vibrant and is now showing signs of dullness or uneven coloration, it may be due to prolonged sun exposure. Sealing with UV-resistant formulations can protect the concrete from the damaging effects of sunlight, maintaining its appearance for an extended period.

Choosing the Right Sealer for the Job

Once the warning signs are identified, the next crucial step is selecting the right sealer for your specific needs. The market offers a variety of sealers with different formulations and properties. Consider the following factors when choosing a sealer:

Type of Sealer:

Determine whether a penetrating sealer or a film-forming sealer is more suitable for your application. Penetrating sealers are absorbed into the concrete, providing protection from within, while film-forming sealers create a protective layer on the surface.

Environmental Conditions:

Take into account the climate and environmental conditions your concrete is exposed to. For instance, if your concrete is outdoors and subjected to harsh weather conditions, a sealer with weather-resistant properties is essential.


Consider the expected lifespan of the sealer. Some sealers offer long-lasting protection, reducing the frequency of reapplication, while others may need more regular maintenance.


Different sealers can have varying effects on the appearance of concrete. Some sealers enhance the natural color of the concrete, while others may add a glossy finish. Choose a sealer that aligns with your aesthetic preferences.

Ease of Application:

Evaluate the ease of application, especially if you are considering a DIY project. Some sealers require professional application, while others are designed for straightforward use by homeowners.

DIY vs. Professional Application

Once you’ve selected the appropriate sealer, the question arises: should you tackle the application yourself or enlist the services of a professional? While some sealers are user-friendly and suitable for DIY projects, others may necessitate the expertise of a trained applicator.

DIY Application:

For smaller projects or individuals with some DIY experience, applying a sealer independently can be a cost-effective and rewarding endeavor. Penetrating sealers, in particular, are often well-suited for DIY applications, as they typically require less precision during application.

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Before starting, thoroughly clean the concrete surface to ensure optimal sealer penetration. Follow the manufacturer’s guidelines regarding application tools, drying times, and any other specific instructions. Keep in mind that multiple thin coats are generally more effective than a single thick application.

Professional Application:

Larger projects or scenarios where precision is crucial may benefit from professional application. Moreover, certain sealers, especially some high-performance film-forming varieties, may require specialized equipment and expertise for optimal results.

Professional applicators are well-versed in surface preparation, ensuring that the sealer bonds effectively with the concrete. They also have the knowledge to choose the most suitable sealer based on the specific requirements of the project.

Sealing Process: Step by Step

Whether you opt for a DIY approach or a professional application, the sealing process generally involves the following steps:

Surface Preparation:

Thoroughly clean the concrete surface to remove dirt, dust, oil, and any other contaminants. Repair any cracks or damage to ensure a smooth and even application.


Apply the sealer according to the manufacturer’s instructions. Use the recommended tools, such as brushes, rollers, or sprayers, depending on the type of sealer. Ensure even coverage and avoid puddling.

Drying Time:

Allow the sealer to dry completely before exposing the concrete to foot traffic, vehicles, or other stressors. Drying times vary depending on the type of sealer and environmental conditions.


Some sealers may require a curing period for optimal performance. Follow the recommended curing guidelines to ensure the sealer fully bonds with the concrete.


Regularly inspect the sealed concrete for signs of wear or damage. Perform any necessary maintenance, such as cleaning or reapplication, to keep the sealer effective over time.

Benefits of Timely Sealing

Addressing the warning signs and applying sealers in a timely manner offers a multitude of benefits for concrete surfaces:

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Increased Durability:

Sealing reinforces the concrete, making it more resistant to cracking, spalling, and surface erosion. This, in turn, enhances the overall durability and longevity of the structure.

Protection Against Stains:

Sealed concrete is less porous, reducing the likelihood of stains from oil, grease, and other substances. This is particularly beneficial for driveways, garage floors, and other high-traffic areas.

Prevention of Efflorescence:

By minimizing water penetration, sealing helps prevent the formation of efflorescence. This preserves the visual appeal of the concrete and eliminates the need for frequent cleaning to remove the powdery residue.

Enhanced Aesthetic Appeal:

Sealers can enhance the color and appearance of concrete, providing a subtle sheen or bringing out the natural tones of the material. This aesthetic enhancement is especially relevant for decorative concrete surfaces.

UV Protection:

Sealing with UV-resistant formulations safeguards the concrete from the harmful effects of prolonged sun exposure. This protection prevents fading and discoloration, maintaining the vibrancy of colored or decorative concrete.

Simplified Maintenance:

Sealed surfaces are generally easier to clean and maintain. Regular sweeping and occasional washing are often sufficient to keep sealed concrete looking fresh and well-maintained.


Recognizing the warning signs that indicate your concrete needs sealing is a proactive step towards preserving your investment in construction. Whether you choose to take on the sealing process as a DIY project or enlist professional help, the benefits of timely sealing are far-reaching. From increased durability and protection against stains to enhanced aesthetic appeal and simplified maintenance, the advantages of sealing extend the life and integrity of concrete surfaces.

In the realm of construction and maintenance, knowledge is the most powerful tool. By understanding the warning signs and solutions associated with concrete sealing, you empower yourself to make informed decisions that contribute to the long-term health and resilience of your concrete structures. So, pay attention to the signs, choose the right sealer for the job, and embark on the journey of preserving your concrete for years to come.

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