I plan on scrubbing the inside of the ST tank with a Scotchbrite pad and maybe a brash brush. I looked last night and all was dry and there is no visible rust on the tank walls or floor
Jim, if the tank is generally clean and rust free, have you considered a chemical cleaning - which will get in all nooks and crannies otherwise difficult to reach? If there's gunk at the bottom I normally use acetone to dissolve and eliminate, followed by Evaporust to eliminate any specs of rust and general cleaning.
I am lucky, I have never had to seal a tank but that's probably a result if doing only British bike rebuilds and restorations
I myself struggled with several "badly" sealed tanks (all Honda bikes) where I had to completely remove the seal that was applied over rust and peeling off.