Epoxy. Better adhesion through chemistry. These small one-use, mix-in-pack epoxy cups are convenient to have tucked discreetly in your travel kit. If the need arises to make repairs with an epoxy, this stuff will be ready to go. They do not require measuring or other laboratory tomfoolery. Two cups per package. 5 minute cure time. Each cup is 2"x0.3", 6 oz.