ex: boat hull made out of steel
egg yolk. it really works. i know this because i built a surfing bicycle (yeah) that had steel on it.just let the steel soak in the yolk for about 3-4 hours and let it dry in a dark area. this will work.
Metal coating mean the best one is Titanium but it is more expensive .Go for epoxy putty with epoxy painting can solve your need
Well our boat hulls have two types or primer, Red Lead, or a yellow colored paint I think it was zinc-chromate. And then, numerous coats of the grey (Navy) paint. US Navy, ABE5, USS Enterprise
Galvinized means steel with a zinc coating. It is the best. For boats at port, and other fixed objects this can be supplimented with cathodic protection, an electrical method that substitutes corrosion of a sacrificial anode for the rusting of the steel. Epoxy and other coatings tend to be very temporary as they wear and scratch with use and lose all effectiveness if they cannot exclude seawater from contacting the bare metal. Zinc responds to abuse and can 'heal' over minor dings. The zinc is refreshed by periodic painting with a high zinc content paint or by electroplating.
