CorrosionX Heavy Duty is a thicker film version of regular CorrosionX that forms a dripless, dynamic, non-hardening, self-healing film that stubbornly resists displacement by splash or spray - including complete submersion in saltwater. It will slowly penetrate existing rust and corrosion, remove moisture and stop electrolysis. And then it seals moisture out. Unlike wax coatings, it will not dry out, stiffen or crack under stress.