J-B Weld

J-B Weld is a two-part epoxy adhesive (or filler) that can withstand high-temperature environments. J-B Weld can be used to bond surfaces made from metal, porcelain, ceramic, glass, marble, PVC, ABS, concrete, fiberglass, wood, fabric, or paper.[7][8] Alcohol should be avoided when cleaning surfaces, as it can degrade the bond.[9] J-B Weld is water-resistant, petroleum/chemical-resistant (when hardened), and acid-resistant. It also resists shock, vibration, and extreme temperature fluctuations.[8] J-B Weld can withstand a constant temperature of 500 °F (260 °C), and the maximum temperature threshold is approximately 600 °F (316 °C) for 10 minutes.[9] J-B Weld can also be used inside a microwave oven, exposed to microwave radiation instead of infrared radiation (heat).[7]

The product is contained in 2 separate tubes: the "steel" (black tube of resin) and the "hardener" (red tube). Equal amounts are squeezed from both tubes and mixed.[7] For the best bond, surfaces should be roughened (or scratched) with fine or coarse sandpaper.

When first mixed, J-B Weld is subject to sagging or running (slow dripping), more so at warmer temperatures.[2][7] After about 20 minutes the mixture begins to thicken into a putty that can be shaped (with a putty knife or wooden spatula).[7] The mixture will set enough for the glued parts to be handled within 4–6 hours,[7] but requires up to 15 hours (at cool temperatures) to fully cure and harden. Temperatures above 50 °F (10 °C) shorten all these times.[7] After the initial setting period of a few hours, a heat (e.g. from a heat lamp or incandescent light bulb placed near the bond) will speed the curing time.[2][7] Before the initial setting period additional heat will induce a decrease in viscosity, which could result in sag or drip.

J-B Weld can be used as an adhesive, laminate, plug, filler, sealant, or electrical insulator.[8] When fully cured, J-B Weld can be drilled, formed, ground, tapped, machined, sanded, and painted.[8]

While J-B Weld Original epoxy dries to a dark grey color,[10] J-B Weld's ClearWeld epoxy dries clear. [11] Although its bond is not quite as strong as the Original's (3900 psi vs. 5020 psi),[12] ClearWeld is often preferred when appearance is an important consideration.[13]

J-B Kwik (stylized as J-B KWIK) is a two-part epoxy, intended as an adhesive or filler, that can withstand medium-temperature environments (up to 300 °F or 149 °C).[14]

J-B Kwik cures much more quickly, but it is not as strong or as heat-resistant as the original J-B Weld.[2][14] However, J-B Kwik has the same adhesion (1,800 psi or 12 MPa) as J-B Weld, and also does not shrink when hardening.[14]

J-B Kwik can be used to bond surfaces made from any combination of iron, steel, copper, aluminum, brass, bronze, pewter,[14] plus porcelain, wood, ceramic, glass, marble, PVC, ABS, concrete, fiberglass, fabric, or paper.[8][14] J-B Kwik is waterproof, petroleum/chemical-resistant (when cured), acid-resistant; plus resists shock, vibration, and extreme temperature fluctuations.[8]