Top Travel Questions – Answered

Sealing Exposed Aggregate Concrete Patios: Preserving Beauty for Endless Travels

How to Seal an Exposed Aggregate Concrete Patio: A Comprehensive Guide

When it comes to enhancing the longevity and appearance of your exposed aggregate concrete patio, sealing is an essential step. By applying a high-quality sealer, you can protect the surface from stains, weathering, and other forms of damage while enhancing its visual appeal. In this article, we will provide you with a comprehensive guide on how to properly seal your exposed aggregate concrete patio to ensure the best possible results.

1. Choosing the right sealer

The first step in sealing your concrete patio is choosing the right sealer for the job. There are several types of sealers on the market, including acrylic, epoxy, and penetrating sealers. Each type has its own advantages and considerations, so it’s important to choose one that meets your specific needs.

Acrylic sealers are popular because of their ease of application and affordability. They form a protective film on the concrete surface that enhances its color and provides good resistance to stains and UV damage. However, they may require more frequent reapplication than other sealers.
Epoxy sealers, on the other hand, offer excellent durability and chemical resistance. They penetrate the concrete surface and provide a hard, glossy finish. Epoxy sealers are ideal for high-traffic areas and provide long-lasting protection. However, they can be more difficult to apply and may require professional assistance.

Penetrating sealers, also known as silane/siloxane sealers, penetrate deep into the concrete to form a water-repellent barrier. They do not alter the appearance of the concrete and provide excellent protection against water and salt damage. Penetrating sealers are a popular choice for outdoor applications, including exposed aggregate concrete patios.

Consider factors such as your specific needs, budget and the level of maintenance you are willing to commit to when choosing the right sealer for your exposed aggregate concrete patio.

2. Preparing the Surface

Proper surface preparation is essential to ensure that the sealer adheres well and provides effective protection. Begin by thoroughly cleaning the surface of your exposed aggregate concrete patio. Remove any dirt, debris or stains with a pressure washer or stiff-bristle brush and a mild detergent. Pay special attention to oil or grease stains, as they may require special cleaning solutions.

After cleaning, allow the deck to dry completely. This may take several days, depending on weather conditions. Make sure that no moisture is trapped in the concrete as this can affect the performance of the sealer.

If there are cracks or damaged areas on the surface, repair them before sealing. Use a suitable concrete patching compound to fill cracks and level the surface. Allow the repairs to cure completely before proceeding with the sealing process.

3. Apply Sealer

Before applying the sealer, it’s important to carefully read and follow the manufacturer’s instructions. Different sealers may have specific application requirements, such as temperature conditions and drying times.
First, protect any adjacent surfaces, such as walls or landscaping, from accidental sealer overspray. Cover with plastic or drop cloths to prevent staining or damage.

Apply sealer evenly to the exposed aggregate concrete patio using a pump sprayer, roller or brush. Work in small sections to ensure thorough coverage and avoid puddles. When using a roller or brush, back-roll the sealer to ensure even distribution and to remove any excess.

Allow the first coat to dry according to the manufacturer’s instructions. Depending on the type of sealer and weather conditions, this may take several hours or overnight. When the first coat is dry, apply a second coat following the same procedure. Two coats are usually recommended for optimum protection and durability.

4. Curing and Maintenance

After the final coat is applied, allow the sealer to cure completely before subjecting the deck to heavy use or foot traffic. Curing times can vary depending on the type of sealer and environmental conditions, so refer to the manufacturer’s instructions for guidance.
Once the sealer is fully cured, it’s important to maintain the deck properly to ensure its longevity. Regular cleaning with a mild detergent and water will help keep the surface free of dirt and debris. Avoid using harsh chemicals or abrasive cleaners as they can damage the sealer.

In areas with harsh winters or extreme weather conditions, it’s a good idea to reapply the sealer every few years to maintain protection and appearance. Regularly inspecting the condition of the sealer will help identify any signs of wear or damage, allowing for timely reapplication.

5. Enhanced visual appeal

Sealing your exposed aggregate concrete patio not only provides protection, but also enhances its visual appeal. Depending on the type of sealer you choose, you can achieve different finishes and effects.

Acrylic sealers, for example, can enhance the color of the aggregate, making it more vibrant and distinctive. They can also add a subtle sheen to the surface, giving it a polished look. If you prefer a matte finish, acrylic sealers are also available for a more natural look.
Epoxy sealers with their glossy finish can give your exposed aggregate patio a sleek and sophisticated look. The glossy surface reflects light, making the colors of the aggregate stones pop and creating an eye-catching effect. This type of sealer is often used in contemporary or modern outdoor designs.

Penetrating sealers, which are invisible once applied, maintain the natural appearance of the concrete without altering its color or texture. This is an ideal choice if you want to maintain the original look of your exposed aggregate patio while providing long-term protection.

Consider your desired aesthetic outcome when choosing a sealer for your patio. Consulting a professional or visiting a local concrete supply store can help you make an informed decision based on your preferences.

In conclusion, sealing your exposed aggregate concrete patio is a critical step in maintaining its durability and aesthetic appeal. By choosing the right sealer, properly preparing the surface and following the application instructions, you can ensure long-lasting protection against stains, weathering and other forms of damage. Regular maintenance and reapplication as needed will help preserve the beauty and functionality of your deck for years to come.


How do you seal exposed aggregate concrete patio?

To seal an exposed aggregate concrete patio, follow these steps:

  1. Clean the surface: Start by thoroughly cleaning the patio to remove any dirt, debris, or stains. Use a pressure washer or a stiff brush and mild detergent to wash the surface.
  2. Allow drying time: After cleaning, give the patio ample time to dry completely. It’s important to ensure that the surface is completely free of moisture before applying the sealer.
  3. Choose the right sealer: Select a sealer that is specifically designed for exposed aggregate concrete. Look for a penetrating sealer that will protect the surface without altering its appearance.
  4. Apply the sealer: Use a roller or sprayer to apply the sealer evenly across the entire patio. Follow the manufacturer’s instructions regarding the number of coats needed and the drying time between each coat.
  5. Allow curing time: After applying the sealer, allow it to cure according to the manufacturer’s instructions. This typically involves keeping the surface dry and avoiding foot traffic for a specified period of time.
  6. Maintain the sealer: To prolong the life of the sealer, regularly clean the patio using a mild detergent and a soft brush. Avoid using harsh chemicals or abrasive cleaners that can damage the sealer.