22-08-15, 04:37 PM
Gearbox oil, EP90. It will stink but paint it on sparingly and it will rustproof, lubricate and will not be thrown off. I've used it to rustproof all manner of things motorcycle, if only the stink wasn't so bad. Beware though if you don't wear gloves you'll never get the smell off your hands.
Never underestimate the ingenuity of an idiot!