time for a new tank, even if leak was from threads old tanks arent
worth messing with.

look at it this way tanks are cheap.

assume 500 bucks for a tank that lasts 10 years, thats 50 bucks a year
roughly a dollar a week.

thats really not much.

consider a new larger tank say going from 40 to 50 gallon or higher BTU
adds little in cost, gives more capacity.

new tanks are better insulated and slightly larger in diameter.
something to check before purchase