Best Glue to Use Underwater

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Although glue is a great tool to have around the house, it’s a little more challenging to find a good glue for underwater use.

There are many reasons why an adhesive would need to be used underwater. Pools and aquariums may require glue to be used fixing equipment in place or repairing equipment without using it out of the water.

Not all glues can harden in a water environment though. Additionally, not all glues for underwater use will adhere to every surface.

If you’re looking for the best glue to use underwater, then these are some of the best options available today.

Image: UnSplash

Loctite Marine Epoxy

This adhesive is permanent and waterproof.

It contains two parts so it’s a great choice for any projects that require a high bonding strength. The adhesive can be applied and cured underwater. It can also be used on glass, wood, metal, and most common materials.

The dual syringe can be used to resin and hardener before applying to the surfaces needed. It has a set time of 2 hours and will cure in 24 hours. Keep in mind that this epoxy is resistant to solvents, and impact so it may not be ideal if you need to remove the bonded items in the future.

Loctite 1919324 Marine Epoxy 0.85-Fluid Ounce Syringe (1405604), 1 Pack, White

Mr. Sticky’s Underwater Glue

This glue combines the binding power of epoxy with the resiliency of rubber to achieve a firm bond. Unlike most adhesives, it will stretch with the bonded materials so this is a good choice when you need some flexibility with the bond.

This epoxy comes in a two-tube system which can be mixed and then applied either above or below water. The epoxy will dry in 2 hours and cure in 24 hours. It can also be used on wood, metal, plastic, and most other common materials. It’s recommended to use it for cracks in spas, pumps, fish ponds, and aquariums. It dries to a white color although it can be painted to match a surface as needed. Overall, this is a durable material that can handle changes in temperature well.

BAC Industries ST-02 Mr.Stickies Underwater Glue

MarineWeld Glue

This two-part adhesive system is designed to provide a long-lasting repair for both different and similar surfaces such as metal, fiberglass, composites, and more. What sets this adhesive apart from the competition is that it is designed to work in extreme environments and once it is set, it creates a bond that is stronger than steel.

It’s recommended use is extreme holding power such as watercraft and hull repairs. This epoxy also sets rapidly in only 20 minutes and fully cures in 24 hours. This adhesive will dry to a white color and can be shaped, filed, drilled, or sanded without losing strength.

J-B Weld 8272 MarineWeld Marine Epoxy – 2 oz.

Choosing The Adhesive

These are three great options that can be used underwater to form a secure bond. Read through each description to decide which option is best for your needs. All work on a variety of surfaces and can be applied underwater to cure.

Gluing underwater is not as impossible as it sounds. Try not to get any on your fingers and make sure you use a snorkel and a mask!

3 Comments on “Best Glue to Use Underwater”

    1. The first option is great, I used this for a leak in the bottom of my hot tub. Works like a charm. Have not lost a drop of water in over a month. Very easy to apply and excellent for continuous underwater use.

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