A lot of radiator shops used a hot tank process it was an acid bath also I believe. It does a good job of cleaning things up. If you coat the tank make sure you read the "fuel tank tour" so you understand the intricacies of the system. Otherwise you will plug up critical passage ways in the tank and flower pot. The cleaning process should not hurt the flower pot. All passages in the flower pot, fuel manifold and the internal vent lines of the fuel tank must be blown clear of sealer before it dries!
Iif you are not doing the sealing yourself, make sure that the person doing it understands the system.
It is most important to remove and clean the intake screen in the electric fuel pump intake fitting. The more obvious drain plug screen in the bottom of the tank should be cleaned up also.