I ended up having a steel tank built. I coated it inside and out with POR 15 paint. Adding 1/2 cup vegetable oil to it after I dump keeps it from rusting. It should last 20 years or so.
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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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