The J-B Weld Company is an international company that produces epoxy products. The home office is based in Sulphur Springs, Texas. J-B Weld (stylized as J-B WELD) is the name of their flagship product: a specialized, high-temperature epoxy adhesive for use in bonding materials together. The company has run advertisements showing engine block repair with J-B Weld.

The J-B Weld Company, founded in 1969 by Sam Bonham in Sulphur Springs, Texas, specializes in epoxy products. Initially, the company sold to automotive shops in Texas, but now distributes its products across the United States and in 27 other countries through various retail channels. After being purchased by private investors in 2008, the company expanded its product line, which originally included J-B Weld, J-B Kwik, J-B Stik, and Waterweld.

J-B Weld epoxy is a two-part adhesive that can bond various surfaces and withstand high temperatures up to 500 °F (260 °C) constantly and 600 °F (316 °C) for short periods. It is water-resistant, petroleum/chemical-resistant, acid-resistant, and resists shock, vibration, and temperature fluctuations. The product consists of a resin and a hardener that need to be mixed before application. The mixture sets in 4-6 hours and fully cures in up to 15 hours. It can be used as an adhesive, laminate, plug, filler, sealant, or electrical insulator and can be drilled, ground, tapped, machined, sanded, and painted when cured.

J-B Kwik is a faster-curing two-part epoxy with medium-temperature resistance up to 300 °F (149 °C). Although not as strong or heat-resistant as J-B Weld, it has the same adhesion and does not shrink when hardening. J-B Kwik is waterproof, petroleum/chemical-resistant, acid-resistant, and resists shock, vibration, and extreme temperature fluctuations.