For long-lasting repairs on concrete pools, consider using non-sag epoxy adhesives to effectively seal and restore vertical concrete cracks in your pool. Concrete pools, while durable and long-lasting, are not immune to the effects of time and environmental factors. Over the years, cracks can inevitably appear in the pool’s structure, compromising its integrity and aesthetics. These cracks may result from various factors, including ground movement, temperature fluctuations, or the natural settling of the pool. To restore the pool to its optimal condition and prevent further damage, you need an effective adhesive to repair the concrete cracks.

Unfortunately, some cracks appear on vertical walls and many adhesive epoxies will drip when applied to vertical surfaces.  Enter non-sag epoxy—an indispensable material for repairing concrete cracks on vertical surfaces of pools, spas, fountains and other water structures.

crack in concrete pool

What Is a Non-sag Epoxy Adhesive?

Non-sag epoxies are a type of epoxy adhesive or sealant that resists flow when dispensed on a substrate.

Resistance to flow is achieved two ways: First by increasing the viscosity of the system, making it thicker, and the second is increasing the thixotropy. Thixotropy describes a material which will flow when sheared (such as when it is being dispensed through a static mixer) and regain it’s high viscosity when not under the shear of dispense.

This combination of properties allows the  non-sag epoxy to be particularly useful for vertical or overhead applications where a standard liquid epoxy might drip or sag before it cures while maintaining the ease of dispense of a flowable material.

Examples of where non-sag epoxies can be applied around the swimming pool area are

  • Repair spalled and cracked concrete floors, swimming pool decks, cantilever decks and pavers
  • Repair pool decks, walkways and driveways in high traffic areas
  • Repair pool and spa coping
  • Bond bricks, stone and hardscape
  • Anchor bolts, screws, rebar, dowels and pins into concrete and masonry
  • Create custom-threaded mountings in concrete
  • Rapidly repair pool deck cracks prior to being coated

How to Select a Good Non-sag Concrete Epoxy

Selecting a good non-sag concrete epoxy involves considering several factors to ensure that the chosen product meets the specific requirements of your application. Here are some key considerations when selecting a non-sag concrete epoxy:

Application Type:

Consider the specific requirements of your application. Different non-sag epoxies may be formulated for various purposes, such as crack repair, bonding, anchoring, or patching.

Compatibility with Concrete:

Ensure that the epoxy is specifically designed for use with concrete surfaces. Some epoxies may be formulated for different materials, so it’s crucial to choose one that adheres well to concrete.

Viscosity and Non-Sag Properties:

Look for a product that explicitly mentions its non-sag or thixotropic properties. The epoxy should have a high viscosity, allowing it to stay in place on vertical or overhead surfaces without dripping.

Mixing Ratio and Ease of Application:

Check the manufacturer’s instructions for the mixing ratio of the epoxy components. A product with a straightforward mixing process can help ensure proper curing and performance. Opt for an epoxy that is easy to apply and work with. The viscosity should allow for precise application, especially in vertical or overhead repairs.

Curing Time:

Consider the curing time of the epoxy. Some applications may require a fast-curing epoxy for quick repairs, while others may allow for a longer curing period. Follow the manufacturer’s recommendations for curing times.

Strength and Durability:

Evaluate the strength and durability of the cured epoxy. Choose a product with sufficient strength to handle the specific demands of your application, whether it’s for structural repairs or cosmetic purposes.

Chemical Resistance and Waterproofing:

Depending on the application, consider the chemical resistance and waterproofing properties of the epoxy. This is particularly important for applications in environments with exposure to chemicals or water, such as swimming pools.

Temperature Resistance:

Ensure that the epoxy can withstand the temperature conditions of the application environment. Some epoxies may be formulated for high-temperature resistance, making them suitable for outdoor or industrial applications.

Color and Appearance:

If the appearance of the epoxy is important for your application (e.g., if it will be visible), check for available color options and the final appearance of the cured epoxy.

User Reviews and Recommendations:

Look for user reviews or recommendations from professionals who have used the product for similar applications. Real-world experiences can provide valuable insights into the performance and reliability of a specific non-sag epoxy.

Compliance with Standards:

Check if the epoxy complies with relevant industry standards or certifications for concrete repair products.

What Makes a Non-sag Epoxy Good for Swimming Pool Repair

When selecting a non-sag epoxy for swimming pool repair, there are additional specific considerations that are crucial to ensure the product is suitable for the unique conditions of pool environments.

Water Resistance:

Swimming pool environments involve constant exposure to water. Choose an epoxy that is specifically designed to be water-resistant or waterproof. This property helps prevent deterioration, weakening, or failure of the epoxy bond in water.

Chemical Resistance:

Pools are treated with various chemicals, including chlorine and other sanitizers. Ensure that the epoxy is chemically resistant to withstand exposure to pool chemicals without degrading or losing its adhesive properties.

concrete crack repaired with non-sag epoxy

Concrete crack repaired with non-sag epoxy

UV Resistance:

If the repair area is exposed to sunlight, consider an epoxy with UV resistance. UV-resistant epoxies are less likely to degrade or discolor when exposed to sunlight, providing long-term durability.

Temperature Stability:

Swimming pool environments can experience temperature fluctuations. Choose an epoxy that can withstand a wide range of temperatures without losing its structural integrity. This is particularly important for outdoor pool applications.

Compatibility with Pool Materials:

Ensure that the epoxy is compatible with the materials commonly found in swimming pools, such as concrete, tile, and pool plaster. The epoxy should bond well with these materials for effective repairs.

Low Shrinkage:

Low shrinkage during the curing process is essential to prevent the formation of gaps or voids in the repair area. A non-sag epoxy with minimal shrinkage helps maintain a strong and durable bond.

Non-Toxic and Safe:

Consider the safety of the epoxy, especially in swimming pool environments where people come into direct contact with the water. Choose a non-toxic epoxy that meets safety standards for use in aquatic environments.

Always follow the manufacturer’s guidelines and recommendations when using non-sag epoxies for swimming pool repair and consider consulting with pool professionals to ensure the chosen product is suitable for your specific repair needs.

AquaBond® professional-grade, non-sag concrete repair epoxy CR-2100 is specially formulated with superior quality components for repairing vertical and overhead concrete cracks in swimming pools, pool decks, spas, fountains and water features. It is

  • Long-lasting, durable and high strength
  • Bonds a wide range of materials including concrete, ceramic, metal, glass, phenolics, wood, and plastic
  • Provides a working time of 30 minutes
  • Gray color – Paintable and sandable
  • Low odor
  • 100% reactive, 2-part epoxy – No solvents to evaporate
  • Excellent chemical resistance and environmental tolerance
  • Low shrinkage
  • Excellent resiliance to low temperatures and extreme flucuations

CR-2100 is a two-part epoxy. It is easy to apply using AquaBond’s no-mess, no-waste resealable cartridge system. Using a dispensing gun and static mixers, you mix and apply only what you need, only when you need it.  Static mixers ensure a precise and consistent ratio of the two epoxy components. Contact with resins is eliminated.  The dispensing gun allows for accurate and controlled application, reducing waste.  Begin with a complete DMK-2100 Starter Kit, then purchase additional cartridges and static mixer tips as needed.

How to Use Non-sag Epoxies for Vertical Concrete Crack Repair

When it comes to repairing concrete cracks in swimming pools or other applications, non-sag epoxies can be beneficial due to their ability to stay in place and effectively fill and seal cracks.

Always follow the manufacturer’s guidelines and recommendations when using non-sag concrete epoxies, and conduct a small test application if possible, to ensure compatibility and performance.

Surface Preparation:

Clean the crack thoroughly to remove any dirt, debris, or loose material.

If there is water in the crack, allow it to dry before applying the epoxy.

Bonding Surface:

For the best adhesion, the concrete surfaces should be clean and free of any contaminants, such as oil or grease.


Follow the manufacturer’s instructions for mixing the non-sag epoxy. Typically, this involves combining a resin and hardener in the correct proportions.


Use a suitable application tool, such as a putty knife or a specialized epoxy application tool, to force the non-sag epoxy into the crack.

Ensure that the epoxy completely fills the crack and extends slightly above the surface.


Smooth the surface of the epoxy with a tool or your fingers, if applicable, to create a neat and even finish.


Allow the epoxy to cure according to the manufacturer’s recommendations. Curing times can vary, but it often involves allowing the epoxy to sit undisturbed for a specified period.


If necessary, sand or trim any excess cured epoxy to achieve the desired appearance.

It’s essential to choose a non-sag epoxy specifically designed for concrete repair and to follow the manufacturer’s guidelines closely. Additionally, consider factors such as the intended use of the repaired surface and any specific environmental conditions that may affect the epoxy’s performance. Always wear appropriate protective gear, such as gloves and eye protection, when working with epoxy products.

What Are the Benefits of Using Non-sag Epoxy Adhesives

Using non-sag epoxies offers several benefits, particularly in applications where maintaining a specific shape or position during curing is essential. Here are some advantages of using non-sag epoxies:

Vertical and Overhead Applications:

Non-sag epoxies have high viscosity, allowing them to be applied on vertical or overhead surfaces without dripping or sagging. This property makes them ideal for repairing cracks, filling voids, or anchoring objects in such orientations.

Precise Application:

The thick consistency of non-sag epoxies enables precise application, allowing for targeted placement in specific areas. This precision is particularly advantageous in intricate repairs or applications where accuracy is critical.

Reduced Waste:

Non-sag epoxies minimize waste by adhering to the intended surface without running or dripping. This ensures that the epoxy is used efficiently, with minimal excess material needing to be trimmed or removed after curing.

Enhanced Bonding:

Non-sag epoxies typically exhibit excellent adhesion to various substrates, including concrete, metal, wood, and plastics. This strong bond ensures reliable performance and long-term durability in bonded joints or repaired areas.


Non-sag epoxies are available in various formulations to suit different applications, such as crack repair, anchoring, sealing, or bonding. They can be customized with additives to enhance specific properties like flexibility, chemical resistance, or temperature resistance, making them versatile for a wide range of uses.

Resistance to Sagging:

The thixotropic nature of non-sag epoxies means that they resist sagging or flowing out of position, even when subjected to gravity or pressure. This ensures that the epoxy maintains its intended shape and thickness during the curing process, resulting in a uniform and consistent repair or bond.

Time Savings:

Non-sag epoxies often cure relatively quickly, allowing for faster completion of repairs or applications. This can reduce downtime and minimize disruptions to operations in industrial or commercial settings.


Once cured, non-sag epoxies form strong, durable bonds that withstand mechanical stress, temperature fluctuations, moisture, and chemical exposure. This durability ensures long-lasting performance in demanding environments.

Ease of Use:

Many non-sag epoxies come in convenient packaging, such as cartridges or dual-syringe dispensers, making them easy to handle and apply. They often have straightforward mixing ratios and application procedures, simplifying the repair or bonding process.

Overall, non-sag epoxies offer a reliable solution for a wide range of repair, bonding, and anchoring applications, thanks to their excellent adhesion, precise application, and resistance to sagging.

Looking for a non-sag epoxy for vertical concrete crack repair? Try AquaBond® professional-grade, non-sag concrete repair epoxy CR-2100 today!