I got ripped off on Flea-bay. When the fuel tank arrived I was more concerned about how it would fit on the KTM 520 exc than with the general condition of the tank itself. Once I removed the filler cap, I noticed the grey RTV sealant around the base of the filler neck. I filled the tank with water and my fears were confirmed -- the "patch" is not watertight. After removing the sealant, I can now see a crack (void) that goes about half way around the circumference of the filler neck. Has anyone found a fix for patching up these plastic tanks? I'm guessing that RTV sealant is not the way to go. Anyone out there with successful epoxy experience???