Battle of the Waterproofing: Drylok vs Flex Seal

When it comes to waterproofing products, two popular names that often come up in the conversation are Drylok and Flex Seal. These products are designed to protect surfaces from water damage, but they work in different ways and have their strengths and weaknesses.

Drylok: A Closer Look

Drylok is a brand of waterproofing products that includes paints, sealers, and masonry waterproofers. These products are designed to keep water out and prevent moisture-related damage to surfaces such as concrete, stucco, and brick.

One of the key benefits of Drylok is its ability to create a barrier against water penetration. When properly applied, it forms a protective layer that prevents moisture from seeping through the surface. This makes it an ideal solution for basements, foundation walls, and other areas that are prone to water intrusion.

Drylok is available in a range of formulations, including latex-based and oil-based options. This gives consumers the flexibility to choose a product that best suits their specific waterproofing needs.

Flex Seal: An Overview

Flex Seal is a liquid rubber coating that can be applied to a variety of surfaces to create a flexible, watertight seal. It is designed to fill in cracks and gaps, making it an effective solution for repairing leaks and preventing water damage.

One of the main advantages of Flex Seal is its versatility. It can be used on a wide range of materials, including metal, wood, plastic, and fabric. This makes it a go-to option for DIY enthusiasts and homeowners looking for a quick and easy waterproofing solution.

Flex Seal comes in different forms, including spray cans, brush-on liquid, and tape. This gives users the freedom to choose the application method that best suits their project requirements.

The Showdown: Drylok vs Flex Seal

So, how do Drylok and Flex Seal compare when it comes to waterproofing performance? Both products have their own set of advantages and drawbacks, and the choice between the two largely depends on the specific needs of the project.

Drylok is best suited for creating a protective barrier against water infiltration. It is ideal for applications where a durable, long-lasting waterproofing solution is needed, such as basement walls and foundation surfaces. However, it may not be the best option for repairing smaller cracks and leaks.

On the other hand, Flex Seal is more versatile and can be used for a wide range of waterproofing and repair applications. It is quick and easy to apply, making it a convenient choice for DIY projects and emergency repairs. However, it may not provide the same level of long-term protection as Drylok for larger surface areas.


In conclusion, both Drylok and Flex Seal are effective waterproofing products that serve different purposes. Drylok excels in creating a durable barrier against water penetration, making it an ideal choice for long-term protection. Flex Seal, on the other hand, is a versatile solution for quick repairs and a wide range of materials.

Ultimately, the best option depends on the specific needs of the project, the type of surface being treated, and the extent of the waterproofing required. Whether you choose Drylok or Flex Seal, it’s important to follow the manufacturer’s instructions for proper application to ensure optimal results.


Is Drylok suitable for outdoor applications?

Yes, Drylok can be used for outdoor waterproofing applications, such as sealing concrete patio surfaces and protecting exterior masonry walls.

Can Flex Seal be painted over?

Yes, Flex Seal can be painted over once it has fully dried. However, it is important to follow the manufacturer’s recommendations for compatibility with specific types of paint.

Which product is better for repairing leaks in a roof?

Flex Seal is a popular choice for temporary roof leak repairs, as it can be applied quickly and easily. However, for a more permanent fix, a professional roofing sealant may be more suitable.

Are Drylok and Flex Seal suitable for use in swimming pools?

Drylok and Flex Seal are not recommended for use in swimming pools, as they are not designed to withstand constant submersion in water.

drylok vs flex seal
The battle of the waterproofing between Drylok and Flex Seal has been a long-debated topic among homeowners and DIY enthusiasts. Both products claim to provide a waterproof barrier to protect surfaces from moisture and water damage, but they have different qualities and applications.

Drylok is a waterproofing paint that is specifically designed for masonry surfaces such as basement walls, foundation walls, and other concrete and block surfaces. It is a latex-based formula that creates a breathable barrier to block water from entering through the surface. Drylok is known for its ability to withstand hydrostatic pressure and can be applied to both interior and exterior surfaces.

On the other hand, Flex Seal is a liquid rubber sealant that can be sprayed, brushed, or rolled onto surfaces to create a flexible and waterproof barrier. It is a versatile product that can be used on a wide range of surfaces, including metal, wood, plastic, and more. Flex Seal is ideal for sealing leaks, cracks, and gaps in roofs, gutters, pipes, and other areas where water might seep through.

One of the key differences between Drylok and Flex Seal is their application method. Drylok must be applied using a brush or roller, while Flex Seal can be sprayed on for quick and easy coverage. This makes Flex Seal a more convenient option for projects that require a large area to be sealed, while Drylok is better suited for smaller, more precise applications.

In terms of durability, both products claim to provide long-lasting waterproofing protection. Drylok is known for its resistance to mildew and can be painted over once it has dried. Flex Seal, on the other hand, forms a strong, rubberized barrier that can withstand extreme weather conditions and temperature changes without cracking or peeling.

When it comes to cost, Drylok and Flex Seal are comparable in price, but the amount of product needed for a project may vary. Drylok requires multiple coats for optimal waterproofing, while Flex Seal may only need one or two coats, depending on the surface and application method.

Ultimately, the choice between Drylok and Flex Seal comes down to the specific needs of the project and the surface being waterproofed. Both products have their advantages and can provide reliable waterproofing protection for a variety of applications, but it’s important to consider the unique qualities of each product before making a decision. drylok vs flex seal

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