Underwater Sealants | McMaster-Carr

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107 Products

About Sealant Flexibility

Submersible Sealants

These sealants are marine grade, so they stand up to water, corrosion from salt spray, mildew, and UV light.

Structural Submersible Sealants

The strongest submersible sealants we offer, these combine the mechanical strength of an adhesive with excellent sealing properties and high flexibility.

All-Weather Application Sealants

Apply these sealants in cold temperatures, on wet surfaces, and even through running water.

Optically Clear All-Weather Application Sealants

Clear enough to read through, this UV-resistant sealant allows optimal light transmission for use with solar cells and fiber optics.

All-Weather Application Structural Sealants

Apply these sealants in cold temperatures, on wet surfaces, and even through running water.

All-Weather Application Concrete Joint Sealants

These non-sagging sealants will not drip while hardening on vertical and overhead surfaces.

Self-Leveling All-Weather
Application Concrete Joint Sealants

Thinner than non-sagging sealants, these flow easily into cracks and have a smooth finish.

All-Weather Application Roof Joint Sealants

Fix roof leaks in cold and wet conditions. These sealants can even be applied underwater.

Adhesives

Waterproof Epoxy Structural Adhesives

Even when used under water, these adhesives maintain their strength.

Epoxy Structural Adhesives for Harsh Environments

With excellent resistance to corrosive chemicals and salt water, these epoxies work in tough conditions.

Moisture-Resistant Light-Activated
Instant-Bond Adhesives

Moisture, humidity, and immersion in water won't degrade the bond of these adhesives.

Submersible Anchoring Adhesives for Concrete

When concrete is saturated or submerged in water, use these adhesives to form strong bonds.

Surface Fillers

Water-Resistant Surface Fillers

Mix these two-part epoxy surface fillers to create a strong repair in wet environments or underwater.

Water-Resistant Surface Filler Kits

Everything you need to repair cracked, worn, and damaged surfaces—even underwater.

Surface Fillers for Fabric-Covered Neoprene Foam

Waterproof and strong, these surface fillers remain flexible when repairing rips, tears, and holes in neoprene rubber. They're often used on wetsuits.

Asphalt Patching Compounds

Spread patching compounds in dry, wet, and even water-filled holes.

Protective Coatings

Submersible Polyurethane Coatings

These coatings provide chemical, corrosion, and impact resistance on grit-blasted concrete and primed steel in immersion, underground, and waste-water treatment applications.

Submersible Epoxy Coatings

Also known as coal tar epoxy, these coatings are our most resistant to abrasion, chemicals, and corrosion on concrete and steel. They can be immersed in salt water and fresh water.

Epoxy Potting Compounds for Harsh Environments

Tough enough to be permanently submersed in seawater, these compounds protect sensitive electronics, such as circuit boards, semiconductors, and sensors in harsh environments.

Reusable Silicone Potting Compounds

Make repairs or changes to electrical components after they’ve been potted. While most compounds are permanent, these form a gel that bonds to itself, so you can peel it off without damaging your equipment.

Urethane Potting Compounds
for Harsh Environments

From shore to sea floor, these potting compounds are formulated for permanent submersion in water—even salt water. Use them to protect circuits and splices in pumps and underwater lighting, as well as other underwater electronics from corrosion and chemicals.

Optically Clear Two-Part
Silicone Potting Compounds

Clear enough to read through, these UV-resistant potting compounds allow optimal light transmission for use with LEDs, solar cells, and fiber optics.