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Leak from threads on steam return pipe
I have a very old steam boiler (probably 40+ years). Recently, I had a pipe that came out of the bottom of the boiler replaced because it had rusted through and was slowly leaking. Since then, another leak as formed on a smaller 2'' pipe where it is threaded into a 90 degree fitting ( I believe this is the steam return pipe, I'm not very knowledgeable about my heating system). Its only leaking maybe 1 drop of water every 20 minutes or so. Is it possible to seal this using rector seal or some other type of fiberglass pipe wrap? I really do not have the money to have a plumber come again and was hoping this would work. If it doesn't work, will it make the repair more expensive if a plumber has to come and then remove the pipe wrap also?