If it's not too late (scrapped tank), we used what they called (wickin) to help seal sloppy threads. This was candle wicking (cotton thread) which was wrapped around the male threads and covered with pipe dope. Never had a leaking thread that coud not be repaired with this. In an emergency we use a wet mop thread which has been unwound to get a smaller thread and it usually works great, cotton preferred.
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