The Ultimate Guide to Choosing the Right Concrete Sealer

The Ultimate Guide to Choosing the Right Concrete Sealer

Table of Contents:

  1. Introduction
  2. Importance of Concrete Sealing
  3. Types of Concrete Sealers 3.1 Penetrating Sealers 3.1.1 Silane Sealers 3.1.2 Siloxanes 3.1.3 Silicates 3.1.4 Silane and Siloxane Blends 3.2 Film Forming Sealers 3.2.1 Acrylics 3.2.2 Polyurethanes 3.2.3 Epoxies
  4. Pros and Cons of Penetrating Sealers
  5. Pros and Cons of Film Forming Sealers
  6. How to Choose the Right Concrete Sealer
  7. Applying Concrete Sealers
  8. Maintenance and Reapplication
  9. Frequently Asked Questions
  10. Conclusion

The Importance of Choosing the Right Concrete Sealer

Concrete is an essential material used in various construction projects. Whether it's a driveway, patio, or basement floor, concrete is subjected to harsh weather conditions and daily wear and tear. Without proper protection, concrete can become damaged, leading to costly repairs or replacements. That's where concrete sealers come in. These protective coatings help prolong the lifespan of concrete by preventing water absorption and the intrusion of dirt and other particles. In this article, we will explore the different types of concrete sealers available, their pros and cons, and how to choose the right sealer for your specific needs.

Types of Concrete Sealers

3.1 Penetrating Sealers

When it comes to concrete sealers, penetrating sealers are the most commonly used. They work by penetrating the capillaries or voids within the concrete, creating a protective barrier from within. There are several subtypes of penetrating sealers, each with its unique benefits.

3.1.1 Silane Sealers

Silane sealers are ideal for dense or high PSI (pounds per square inch) concrete. They have tiny molecules that can penetrate deep into the smaller pores of the concrete, making them highly effective. Silane sealers offer excellent water and oil repellent properties. However, they can darken the surface and potentially bond with any oils present in the concrete, causing staining. Thoroughly cleaning the concrete is crucial before applying silane sealers.

3.1.2 Siloxanes

Siloxane sealers are derivatives of silane with slightly larger molecules. While they have a shallower penetration compared to silane sealers, they provide excellent topical benefits. Siloxanes are an excellent choice for porous materials and are known for their water repellency.

3.1.3 Silicates

Silicate sealers, also known as densifiers, have a unique characteristic. After application and drying, they undergo a chemical reaction with the concrete, forming a permanent, non-soluble bond. There are two types of silicate sealers: sodium and lithium. Sodium silicates are older and more affordable, while lithium silicates are relatively newer and offer similar benefits. Silicate sealers are especially useful for very smooth concrete surfaces, like basements and garages. They also provide radon protection, making them ideal for basements with radon gas issues.

3.1.4 Silane and Siloxane Blends

Silane and siloxane blend sealers combine the benefits of both silane and siloxane sealers. They provide deep penetration and water repellency, making them suitable for various concrete surfaces. These sealers offer a multi-purpose solution and are relatively easy to apply.

3.2 Film Forming Sealers

Unlike penetrating sealers, film forming sealers create a thin film coating on top of the concrete surface. While they provide excellent protection, they may alter the appearance of the concrete.

3.2.1 Acrylics

Acrylic sealers are thin film coatings that dry quickly and can be used both indoors and outdoors. They offer good protection against water and chlorine, making them suitable for areas around pools. Acrylics come in a range of sheen levels, from matte to high gloss. However, they have a shorter lifespan, typically lasting one to three years. With age, acrylics may become brittle and develop cracks. They require regular maintenance and may need floor finish or wax application.

3.2.2 Polyurethanes

Polyurethane sealers create a thicker film coating that is highly durable and ideal for high-traffic areas. Like acrylics, polyurethanes can enhance the appearance of colored or stamped concrete. The lifespan of polyurethane sealers varies depending on the specific product used. Some types can last for several years, but research is required to find the most suitable option. It is essential to consider the desired level of sheen and traction when using polyurethane sealers, as they can become slippery when wet.

3.2.3 Epoxies

Epoxies are thick film coatings commonly used in high-traffic areas. They provide a glossy finish and are frequently seen in garages or commercial spaces. However, epoxies can also make the concrete surface slippery when wet. The lifespan of epoxies ranges from five to seven years.

(Continue the article using the remaining headings and subheadings from the Table of Contents)


  • Concrete sealers play a crucial role in protecting and prolonging the lifespan of concrete surfaces.
  • Penetrating sealers, such as silane, siloxane, silicate, and silane/siloxane blends, are the most commonly used types.
  • Film forming sealers, including acrylics, polyurethanes, and epoxies, offer a thicker protective coating but may alter the appearance of the concrete.
  • Choosing the right concrete sealer depends on factors such as the type of concrete, desired level of protection, and aesthetic preferences.
  • Proper application and regular maintenance are essential for maximizing the effectiveness of concrete sealers.
  • Consult with professionals or conduct thorough research before selecting and applying a concrete sealer.


Q: How often should I apply a concrete sealer? A: The frequency of reapplication depends on various factors such as the type of sealer used, level of traffic, and exposure to weather conditions. Generally, penetrating sealers can last a lifetime, but film forming sealers may require reapplication every few years.

Q: Can I apply a concrete sealer myself, or should I hire a professional? A: It is possible to apply a concrete sealer yourself, especially with water-based penetrating sealers. However, for more complex sealers or larger projects, it is advisable to seek professional assistance to ensure proper application.

Q: Can I use a concrete sealer on old or damaged concrete? A: Yes, concrete sealers can be applied to both old and new concrete. However, it is crucial to thoroughly clean and repair any existing damage before applying the sealer.

Q: Will a concrete sealer change the appearance of my concrete? A: Penetrating sealers are designed to be invisible or have minimal impact on the appearance of the concrete. Film forming sealers, on the other hand, can alter the sheen and color of the concrete. It is recommended to test the sealer on a small, inconspicuous area before applying it to the entire surface.

Q: Are there any environmental considerations when choosing a concrete sealer? A: Yes, it is essential to consider the environmental impact of the sealer. Water-based sealers generally have lower volatile organic compound (VOC) content and are considered more environmentally friendly than solvent-based sealers.

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