Sealing Exposed Aggregate Concrete: What You Need to Know

Sealing Exposed Aggregate Concrete: What You Need to Know

Are you considering sealing your exposed aggregate concrete, but unsure of where to start? Look no further! In this comprehensive guide, we will cover everything you need to know about the benefits of sealing exposed aggregate concrete, the different types of sealers available, and step-by-step instructions on how to properly seal your concrete surface. Whether you’re a homeowner looking to enhance the durability and appearance of your driveway or a contractor seeking to provide top-notch sealing services, this article has got you covered.

Benefits of Sealing Exposed Aggregate Concrete

Enhances the aesthetic appeal

Sealing exposed aggregate concrete can enhance the overall appearance of your outdoor space. The sealer can bring out the natural colors and textures of the aggregate stones, giving your concrete surface a more polished and attractive look. Additionally, the sealer can provide a glossy finish that adds a touch of elegance to your outdoor area.

Protects against stains and discoloration

One of the key benefits of sealing exposed aggregate concrete is that it helps protect the surface against stains and discoloration. The sealer creates a protective barrier that prevents oil, grease, dirt, and other substances from penetrating the concrete and causing unsightly stains. This can help keep your concrete looking clean and well-maintained for a longer period of time.

Increases durability and longevity

Sealing exposed aggregate concrete can also help increase the durability and longevity of the surface. The sealer acts as a shield against harsh weather conditions, UV rays, and heavy foot traffic, helping to prevent cracks, chips, and erosion. By sealing your exposed aggregate concrete, you can extend the lifespan of your outdoor surface and reduce the need for costly repairs in the future.

Types of Sealants for Exposed Aggregate Concrete

When it comes to sealing exposed aggregate concrete, there are several types of sealants to choose from. Each type of sealant offers different benefits and protection for your concrete surface. Here are the most common types of sealants used for exposed aggregate concrete:

Penetrating Sealers

Penetrating sealers are a popular choice for sealing exposed aggregate concrete because they penetrate deep into the pores of the concrete, forming a chemical barrier that protects against water, oil, and other contaminants. These sealers do not change the appearance of the concrete and are ideal for preserving the natural look of exposed aggregate.

Acrylic Sealers

Acrylic sealers are another common choice for sealing exposed aggregate concrete. These sealers form a protective film on the surface of the concrete, enhancing its color and giving it a glossy finish. Acrylic sealers are available in both water-based and solvent-based formulas, making them versatile and easy to apply.

Epoxy Sealers

Epoxy sealers are a more durable option for sealing exposed aggregate concrete. These sealers create a strong, chemical-resistant barrier on the surface of the concrete, protecting it from stains, abrasion, and UV damage. Epoxy sealers are commonly used in high-traffic areas or commercial settings where extra protection is needed.

When choosing a sealant for your exposed aggregate concrete, consider the level of protection you need, as well as the desired appearance of the surface. Consulting with a professional can help you determine the best sealant for your specific needs.

Steps to Seal Exposed Aggregate Concrete

Cleaning and preparation

Before sealing exposed aggregate concrete, it is important to clean the surface thoroughly. Begin by removing any dirt, debris, or stains using a pressure washer or a stiff bristle brush. For tough stains, you may need to use a commercial cleaner. Once the surface is clean, allow it to dry completely before moving on to the next step.

Applying the sealer

Once the concrete surface is clean and dry, it is time to apply the sealer. Choose a high-quality sealer specifically designed for exposed aggregate concrete. Using a roller or sprayer, apply the sealer evenly across the surface, making sure to cover the entire area. It is important to follow the manufacturer’s instructions for application, including the number of coats required and the drying time between coats.

Allowing for curing time

After applying the sealer, it is essential to allow for proper curing time before using the surface. Curing time can vary depending on the type of sealer used, as well as environmental factors such as temperature and humidity. In general, it is recommended to wait at least 24 hours before walking on the sealed surface and up to 72 hours before driving or placing heavy objects on it. Be sure to follow the manufacturer’s guidelines for curing time to ensure the sealer properly bonds to the concrete and provides long-lasting protection.

Maintenance Tips for Sealed Exposed Aggregate Concrete

Regular Cleaning

Regular cleaning is essential to maintaining the appearance and longevity of sealed exposed aggregate concrete. Use a mild soap or detergent mixed with water to scrub the surface and remove any dirt, grime, or stains. Avoid using harsh chemicals or abrasive cleaners, as these can damage the sealer and the concrete underneath.

Avoiding Harsh Chemicals

As mentioned above, harsh chemicals should be avoided when cleaning sealed exposed aggregate concrete. This includes products like bleach, ammonia, and acidic cleaners, as they can strip away the sealer and cause discoloration or damage to the concrete. Stick to gentle cleaning solutions to preserve the integrity of the sealer and keep your concrete looking its best.

Reapplication of Sealer

Over time, the sealer on exposed aggregate concrete will wear down due to foot traffic, weather exposure, and general wear and tear. It’s important to periodically reapply sealer to maintain the protective barrier and keep the surface looking fresh. The frequency of reapplication will depend on factors like the type of sealer used, the amount of traffic the concrete receives, and the climate in which it is located. Consult with a professional or the sealer manufacturer for specific guidelines on when and how to reapply sealer.


In conclusion, sealing exposed aggregate concrete is a crucial step in ensuring its longevity and maintaining its aesthetic appeal. By understanding the benefits of sealing, the different types of sealers available, and the proper application process, you can protect your investment and enjoy your beautiful concrete surfaces for years to come. Remember to consult with a professional if you are unsure about which sealer to use or how to properly apply it. With the right knowledge and maintenance, your exposed aggregate concrete can continue to enhance the look of your property for years to come.