POR has failed over time with several of my MV friends. The white teflon separates and the film gums up the tubes.
I have used a newer product called "Red Kote" -http://damonq.com/red-kote.html
RED-KOTEŽ
Red-Kote is an internal fuel tank liner designed to seal leaks and prevent further rusting. As a sealant, Red-Kote excels at sealing the often hundreds of pin-hole leaks that occur along seams or where straps wrap around the tank. Once in place, Red-Kote forms a very tough, flexible membrane that will never crack or flake as many competitive products do. Red-Kote will not plug lines or cause engine damage when used properly. Future rust will be prevented because condensation will not contact the metal. A partial list of additives that Red-Kote is resistant to includes ethyl alcohol, methyl alcohol, toluene, methyl tertiary butyl ether, isopropyl alcohol and tetraethyl lead. Red-Kote takes approximately eight hours to dry. Packaged nine quarts per case or single gallons.
I have used this on a Dingo and the Humber main and aux tanks and not problems yet.
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