J-B Weld 8277 WaterWeld Epoxy Putty Stick - 2 oz.

The J-B Weld 8277 WaterWeld Epoxy Putty Stick is a hand-mixable, two-part repair compound formulated to cure under wet conditions and even fully submerged underwater. Designed to tackle active leaks and moisture-prone surfaces, it provides an immediate fix for household plumbing, boat hulls, fuel tanks, tubs, showers, and pool equipment.

Using the putty is straightforward: you cut off the desired amount and knead the two parts together by hand until uniformly mixed. Once applied, the compound sets in 25 minutes and reaches a full cure in 1 hour, drying to an off-white finish. Because it is certified by the NSF for contact with potable water, it is safe to use on residential drinking water tanks and lines.

In terms of performance, WaterWeld delivers a lap shear strength of 1300 PSI and bonds to a wide array of materials, including iron, stainless steel, copper, brass, aluminum, bronze, fiberglass, plastic, and PVC. It handles continuous temperatures up to 300 degrees Fahrenheit (149 degrees Celsius) and intermittent exposure up to 350 degrees Fahrenheit (176 degrees Celsius), while offering chemical resistance against petroleum, hydraulic fluids, and other chemicals once fully cured.

As for trade-offs, the product comes in a compact 2-ounce stick, which may require multiple packs for larger patching projects. It cures strictly in an off-white shade, and achieving a proper hold relies entirely on thoroughly kneading the two parts together by hand before application.

Verdict: The J-B Weld WaterWeld is an essential patch kit for homeowners, boaters, and DIYers dealing with wet leaks or submerged repairs. Its NSF potable water certification and rapid 1-hour cure time make it a reliable choice for emergency plumbing and marine fixes.

• Weight: 2 oz.
• Set Time: 25 minutes
• Cure Time: 1 hour
• Cured Color: Off-white
• Lap Shear Strength: 1300 PSI
• Continuous Temperature Limit: 300°F (149°C)
• Intermittent Temperature Limit: 350°F (176°C)
• Certification: NSF certified for potable water
• Compatible Surfaces: Iron, stainless steel, copper, brass, aluminum, bronze, fiberglass, plastic, PVC

A great fit if you:

• Need to repair an active leak on plumbing, tubs, showers, or drains without waiting for surfaces to dry.
• Require an NSF-certified patch safe for potable drinking water tanks and lines.
• Want a fast-acting adhesive that cures fully in one hour with 1300 PSI strength.
• Are patching fiberglass boat hulls, pool fixtures, or chemical-exposed fuel tanks.

Consider something else if you:

• Have a large-scale project that exceeds the coverage of a 2-ounce putty stick.
• Need a repair compound that cures to a clear or dark finish rather than off-white.

Can this epoxy be used on drinking water pipes?
Yes, J-B Weld WaterWeld is certified by the NSF and is safe for contact with potable water systems.

How long does WaterWeld take to set and cure?
After kneading the two parts together by hand, the putty sets in 25 minutes and reaches a full cure in 1 hour.

What materials can this putty stick bond to?
It bonds to iron, stainless steel, copper, brass, aluminum, bronze, fiberglass, plastic, and PVC.

What temperature range can it withstand?
Once fully cured, it withstands continuous temperatures up to 300 degrees Fahrenheit (149 degrees Celsius) and intermittent temperatures up to 350 degrees Fahrenheit (176 degrees Celsius).