J-B Weld 8280 Professional Size Steel Reinforced Epoxy
This is J-B Weld's original epoxy product, designed for metal to metal adhesion. However, it works just as well on a variety of other substrates, including most architectural substrates. It can be used for plumbing and marine repairs, as well as automotive repairs. This particular product is steel reinforced, making it incredibly strong; the cured epoxy provides 3960 PSI of tensile strength. It is also fairly good for high temperature applications, as it will withstand temperatures up to 550 degrees Fahrenheit when fully cured.
This is a slow-curing product, giving you a long working time. The set time is four to six hours, depending on temperature and the full cure time is 15 to 24 hours. So, this isn't what you want to use when you're trying to make a quick repair. J-B Weld also has a quick cure epoxy that sets in six minutes. However, the fully cured epoxy is quite durable and can be shaped, including drilling and tapping, once cured. Comes packaged in two 5 ounce bottles.