Last Updated on April 10, 2025
Flex Seal is a versatile material widely used for sealing pipe leaks and filling cracks—including those found in driveways. It’s a cost-effective solution, allowing homeowners to repair surfaces without replacing entire sections. Whether it’s a cracked asphalt or concrete driveway, Flex Seal can provide a quick and lasting fix.
What Is the Main Purpose of Using Flex Seal?
Flex Seal is a liquid rubber sealant designed to coat, seal, and stop leaks or cracks. Introduced in 2002, it has remained one of the most popular crack fillers and leak-stopping solutions for both indoor and outdoor repairs.
From sealing vent pipe leaks to filling small cracks in your driveway, Flex Seal is a go-to option for many homeowners due to its flexibility, durability, and ease of use. If you’re specifically dealing with asphalt surfaces, check out our in-depth guide on whether Flex Seal is suitable for asphalt driveways.
Can I Use Flex Seal as a Driveway Sealer?
While Flex Seal is mainly used to fill driveway cracks, it can also function as a temporary driveway sealer. Its biggest advantage? It can be applied in rainy or wet conditions—even underwater—which makes it ideal for emergency sealing jobs during winter or the rainy season.
However, it’s important to note that Flex Seal is not a substitute for heavy-duty asphalt or concrete driveway sealers for large-scale applications. It’s best used as a crack filler or for small repair areas.
Does Flex Seal Work Effectively?
Yes, Flex Seal performs exceptionally well on small cracks in both concrete and asphalt driveways. It’s especially effective in challenging conditions, such as during rain or in high-humidity environments when traditional sealers may not adhere properly.
It also dries quickly and creates a waterproof barrier, helping prevent water from seeping into the cracks and causing further damage. An added bonus—its strong seal discourages insects from nesting in the cracks.
What Is the Most Popular Crack Filler for Driveways?
There are many types of driveway sealers that double as crack fillers, but Flex Seal is one of the most commonly used for quick and easy driveway crack repairs. Its ability to cure in damp or cold weather makes it a preferred solution over many traditional options.
If you’re dealing with a cracked concrete driveway, Flex Seal is a reliable and affordable fix. With its wide availability and ease of use, there’s no reason to stress about those driveway cracks anymore.
FAQs
1. Can I use Flex Seal to repair cracks in swimming pool walls?
Absolutely. Flex Seal is highly effective for wet surfaces and can be applied even when the area is not fully dry. It’s ideal for sealing cracks in swimming pool walls without the need to drain the pool, making it a convenient and reliable solution for pool maintenance.
2. What surfaces should Flex Seal not be used on?
While Flex Seal works well on a wide range of surfaces—such as concrete, aluminum, rubber, porcelain, and wood—it is not recommended for use on foam, as the chemicals may degrade the material or prevent proper adhesion.
3. Is Flex Seal a good option for driveway cracks?
Yes, Flex Seal is commonly used to fill driveway cracks. Its quick-drying formula, water resistance, and flexibility make it ideal for sealing minor cracks in both concrete and asphalt driveways.
4. Can Flex Seal be used during the rainy season?
Yes, one of Flex Seal’s biggest advantages is that it can be applied in wet conditions—even during rain or underwater. This makes it an excellent choice for emergency repairs or when dry weather isn’t guaranteed.
5. How long does Flex Seal last on driveway cracks?
When applied correctly on a clean, stable surface, Flex Seal can last up to 10 years. Its durability depends on weather conditions, surface type, and the extent of the crack.
6. Can Flex Seal be painted over after application?
Yes, after Flex Seal has completely dried, you can paint over it with most types of paint to match your driveway’s color or surface aesthetics.
7. Is Flex Seal better than traditional crack fillers?
Flex Seal is more versatile than many traditional crack fillers because of its ability to seal in wet conditions, ease of use, and compatibility with various materials. However, for large-scale or structural cracks, a dedicated concrete or asphalt crack filler may offer more strength.
Final thoughts
Thanks to its easy application process and compatibility with various construction materials, Flex Seal has become a popular choice for sealing cracks. While some users may assume it’s expensive, Flex Seal is available in a wide range of price points—many options cost less than $100, making it a cost-effective solution for driveway and home repairs.