There are many fine coatings and sealers on the market.
But the digestive additives in fuels are un-named, un-countable, and constantly changing.
USA fuels of a decade ago would eat nearly all commercial sealers and adhesives, however the past few years have been a reprieve. We hope it is not temporary.
Only testing of sealers and other products directly in your local fuel will determine if there will be a digestivity problem that year. Summer blends have been the worst in the past.
With rising prices, the temptation for illegal solvent dumping into fuels adds another threat.
My philosophy is to avoid anything that may be a target for the fuel, however eroded carburetor bowls (and bowlstems on potmetal Scheblers) do need protection from further deterioration.
My choice is an isocyanate urethane (Omnithane 530 by TNEMEC), as it has never been affected in my testing, even in seasons when the fuel was close to 'alien spit'.
This June, I shall again test various paints, sealers, and other goobers upon etched glass plates submersed in fuel, however it only reveals the nature of one local fuel. It really says little about the products themselves.
And you never know what will come out of the next pump.
Dumpster Diver's Motto: Seek,... and Ye Shall Find!