WD-40 is pretty good stuff but I understand it is not permitted on eg Lloyds insured ships. The problem being that it is a very good solvent for oil products bu

WD-40 is pretty good stuff but I understand it is not permitted on eg Lloyds insured ships. The problem being that it is a very good solvent for oil products but it itself is reasonably volatile and once it dissolved the oil coating on steel parts it will evaporate, leaving the steel exposed in a marine atmosphere which will allow it to rust more than if you just left it. There are other compounds which are preferentially used to provide a lubricating or anti-corrosive coating (eg Boeshield T9) WD-40 is excellent for cleaning your hands after working on your bicycle chain. Of course, you could wear nitrile gloves but.. Also, WD-40 is a good coolant/lubricant for machining aluminium.