The table on our flywheel surfacer got all rusted up from someone using the wrong dilution of coolant. I scuffed it all off, but eventually it came back even with the proper coolant dilution. So after scuffing it all off again, sprayed it with fluid film and let it sit for a whole 24 hours. Afterward I wiped it all off cuz I didnt want it mixing with the coolant. It must have penetrated the steel, 2 years later and still no rust!