be used inside a microwave oven, exposed to microwave radiation instead of infrared radiation (heat). 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. 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); even more so at warmer temperatures. After about 20 minutes the mixture begins to thicken into a putty that can be shaped with a putty knife or wooden spatula. The mixture will set enough for the glued parts to be handled within 4–6 hours, but requires up to 15 hours at cool temperatures to fully cure and harden. Temperatures above shorten all these times. After the initial setting period of a few hours, heat (e.g. from a heat lamp or incandescent light bulb placed near the bond) will speed the curing time. J-B Weld can be used as an adhesive, laminate, plug, filler, sealant, or electrical insulator. When fully cured, J-B Weld can be drilled, formed, ground, tapped, machined, sanded, and painted. While J-B Weld Original epoxy dries to a dark grey color, J-B Weld's ClearWeld epoxy dries clear. Although its bond is not quite as strong as the Original's (3900 psi vs. 5020 psi), ClearWeld is often preferred when appearance is an important consideration. J-B Kwik epoxy 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 ). J-B Kwik cures much more quickly, but it is not as strong or as heat-resistant as the original J-B Weld. However, J-B Kwik has the same adhesion () as J-B Weld, and also does not shrink when hardening. J-B Kwik can be used to bond surfaces made from any combination of iron, steel, copper, aluminum, brass, bronze, pewter, plus porcelain, wood, ceramic, glass, marble, PVC, ABS, concrete, fiberglass, fabric, or paper. J-B Kwik is waterproof, petroleum/chemical-resistant (when cured), acid-resistant; plus resists shock, vibration, and extreme temperature fluctuations. See also Araldite References External links Adhesives Privately held companies based in Texas Polymers American brands