RE: Diesel fuel tank repair - internal coating
The hard epoxies aren't a good call for any non-fixed fuel tanks, as there's always some flex when a boat/airplane/vehicle moves.
The tank sealers that Vans mentions are ideal.* The airplane that I sold last November had wing tanks that were simply a cavity in the wings between ribs that were sealed with PRC (see the Van's article, it's the PPG product now), and even had four inspection ports on the bottom of the tanks which were PRC sealed.* It sticks like hell, is flexible, and completely impervious to petroleum.* My airplane was 30 years old when I sold it, and the tanks were still tight.* And Avgas is a lot more reactive than diesel.
I wouldn't hesitate to use the PRC.
It doesn't seem like the stuff that he coated your tanks with, however, as PRC is more* like a cake frosting instead of a paint.
-- Edited by Chris Foster at 18:54, 2008-11-07
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