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I'm not sure about the access one can obtain by removing the valves and such, but if it's considerable, you could probably get a rod shaped cathode in the tank and try electrolysis. I would caution against Muriatic acid, which is a blend of Sulfuric and Hydrochloric. There's likely to be some Ferric Chloride salts left behind and they might continue to react with any moisture that would ever find it's way into the tank. Also, Muriatic will eat away at the good steel, and possibly cause a hole at one of the thinner spots. If you need to acid treat, consider Phosphoric Acid, which is the non-electrochemical equivalent of electrolysis. It will convert any red rust into black oxide, which will remain stable. It also tends to have very minimal reactance with steel. Since the tank would then be either fresh clean steel or black oxide, you may not have to use a sloshing sealer though I don't if those compounds exist for a propane environment. In a pinch, I guess you could slosh it with a two-part epoxy liquid, which should be durable against the propane. Just some considerations. Frank-in-Tallahassee
70D // 855
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