CorkitÂ® is a two-part epoxy compound in a single stick form. CorkitÂ® will adhere to a wide range of surfaces for fast permanent repairs often eliminating expensive repairs. SteelÂ Inherits Industrial strength and Chemical resistant properties. Steel CorkitÂ® is used to repair fuel tanks, radiators, gaskets, castings, prototypes, stripped threads, anchor bolts. Steel CorkitÂ® has a 7 minute work time.