Using it on a pair of two-stroke engines in two Seadoos that see salt water use. There was already minor corrosion before I started using this but after one of them sank and the other partially flooded (both in salt water), it seemed like a good idea to try to keep the corrosion down. After rinsing with fresh water, sprayed the corrosion inhibitor on steel and aluminum components. Nearly a year later there is no additional corrosion.