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Once the tank is clean and ready for storage, Marvel Mystery Oil works well to protect the tank from rust. One ounce of oil per gallon of tank capacity works well. Once added the tank needs to be rolled around to coat all inside surfaces. Two stroke oil is also commonly used.
WD-40 works well for cleaning and preserving the outside. A bath towel over the top will keep it clean in storage. 13 Gallon trash bags are also helpful in keeping the tank clean in storage.
The cause of most interior rust problems is from the tank losing its seal. It can be caused by degraded hose, connector O-rings, upper housing gasket, or bad/missing fiber washer fastener seals on the upper housing. Once the seal is lost, air gets inside, and with air comes moisture.
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