[BRENT in 10-uh-C]

I was kinda holding off on giving my opinion on this, but I think if you add sealer to the tank, you can pretty much plan on a failure due to the previous owner installing a sealer that is not working. Sealers will not bond to other sealers, especially when they have started degrading. Additionally, the sealer would need to be sloshed and drained which typically requires removing the tank from the vehicle. IMO, there really isn't an easy way except to sell the vehicle to someone else who can deal with the problem. Otherwise, you need to remove the tank, soak it in hot caustic to soften the sealer, -then remove the sealer by scraping followed by removing the bracket, welding up the rivet holes and redrilling new ones to rerivet the bracket back on.