I am not recommending this but.....I have used .............vegetable oil for years. I built a new steel holding tank(black and gray combined) for my Newell 10 years ago. I coated it inside and out with POR 15 and have not seen any rust yet. My theory is that the oil will "float" on top of the waste and keep the exposed steel portion coated and rust free.
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1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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