Is Flex Glue Waterproof?

Yes, Flex Glue is fully waterproof, and there are countless uses for applying the instant grab and hold adhesive when it comes to all of your waterproof glue needs. Since Flex Glue can be applied underwater and can even fully cure underwater, it’s no wonder our product is considered the finest waterproof glue around.

You have tons of options when it comes to purchasing an adhesive, but very few glue products available on the market are intended for underwater usage. Flex Glue stands out from the crowd because it has been specifically designed for application on dry or wet surfaces, even underwater!

We’ve compiled a list of applications related to pool, backyard, boats, and bathroom uses for information and inspiration. Regardless of the project, Flex Glue has you covered!

Underwater Glue for Pools

You can use Flex Glue to fix tiles, gaps, cracks, and any other pool-related repairs. Since Flex Glue can be applied and fully cured underwater, it saves you time, money, and the hassle associated with draining the pool completely by providing quick and long-lasting repairs.

We also offer the Pool Patch and Repair Kit that contains 1 Flex Glue Mini Clear and 2 Flex Tape Mini Clears. For larger projects, we suggest buying fuller sizes of Flex Glue.

Backyard Uses

Flex Glue can help with an assortment of garden and backyard needs. You can use Flex Glue as a bug barrier — by filling in cracks and holes in your patio and elsewhere. Flex Glue can also be applied to brick and other landscaping materials. Additionally, customers trust Flex Glue for gutter and roof repair. So whether it’s a pond, lagoon, fountain, or any other type of garden decor, Flex Glue is the ideal waterproof glue.


You can use Flex Glue for boat repairs and any other nautical equipment. Whether it’s the inside or outside of the boat, on land or in water, Flex Glue’s ability to be applied and cured underwater makes it the leading waterproof glue for all of your maritime needs.

To see the full power of Flex Glue when it comes to withstanding seafaring climates, check out the behind the scenes of the Flex Glue® Clear Commercial and Glass Boat!


Flex Glue can be used for an assortment of bathroom repairs. Customers often use the waterproof glue to fix toilet tanks, shower tiles, sink pipes, and other bathroom needs. Flex Glue is also mold and mildew resistant, making it perfect for bathroom repairs.

For other types of bathroom maintenance and repairs, we also offer Flex Shot for all of your caulking needs!

For more information and uses, be sure to check out How to Use Flex Glue and Flex Glue Reviews. For additional questions and concerns, visit our FAQs page or Contact Us. Flex on!

Get Flex Glue

By Eric Hamilton

Eric is a Web Content Specialist at The Flex Seal Family of Products, where he helps manage and produce digital content.

Related Articles

10 Practical Uses for Flex Super Wide Duct Tape

Upgrading Your Privacy Fence With Flex Seal Products

Flex Glue Vs. Flex Super Glue

How To Fix a Squeaky Floor With Flex Glue

Using Flex Glue on Wood