Early in my trawler ownership I noted rust on the tank tops, outboard surfaces (yes, I could actually reach around between hull and tank), and near the shaft seals, as was already mentioned. I scraped and/or sanded as best I could and then rolled on acidic rust killer like Ospho before top coating. There was some limited access to the bottom sides too. For the tops and outboard sides where I would not often be inspecting, I sprayed on fogging oil to finish off. The original steel tanks were still fine when I sold the 1972 boat in 2015.
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Rich Gano
FROLIC (2005 MainShip 30 Pilot II)
Panama City area
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