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If you spray it make sure your face is covered with a face shield. I knew it didn't come off your hands, but I forgot about my face when I sprayed it. I had the cheetah look for about a week!
the only thing i've ever used is rust encapsulator from eastwood. its on the frame, cab floor and bed support channels. i like the stuff.
i see that KBS has a gas tank sealer kit, have you tried that? i want to avoid buying a new one if possible.