Clean the hell out of the exterior surface, degrease, then acetone, then wipedown, then I put white vinegar in a spray bottle and hit every square centimeter, let it dry and wipe one more time with a clean terry cloth towel and gob it up with Gluv-it. Of course, with proper maintenance, and occasional cleanout, a dry tank will work fine. The trouble with these tanks is the low corner as shown in one of the photos. Water pools there and eats through. All diesel has some water in it. While the Gluv-it will slow down the ultimate disaster, it won't stop that corrosion. Maybe part of the annual layup should be getting in there and cleaning the whole thing out, no fuel in tank over winter. Or a low point drain of some sort (impractical). I had a stainless tank leak out on me in my Bristol 35 because water sat in one (flat) spot in the middle of the tank for too long. It only took a year or so while it was on the hard. One tiny pinhole was all I could find. When I cut the tank out it looked way worse on the inside, in the shape of a water bubble.
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