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@adroit
it depends, if the tank is rally rusty inside it might pay to seal it, but it isn't a long term solution as it will rust through to the outside, even if the crap isn't getting into the carbs.
Best is to give the tank a few swills out with petrol, which you pour out through a rag into a jar and use again and again until next to nothing comes out. Then use a cheap paper inline filter but change it because they soon block, and gravity fed carbs soon run lean if the paper element is partially blocked. Whilst all this is going on look for a new tank!