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Looks kinda like a thick coat of enamel paint brushed on to it. Soak it in paint remover first and remove it all down to bare metal so it doesn't get all burnt and cooked on and make a mess of it while welding or brazing it.
If a weld is leaking it's probably just a pin hole in the weld. I would just get it red hot with an acetylene and oxygen torch and braze over the weld without melting the steel with a flux coated brass brazing rod.
That would seal it up good without disturbing the current weld but either way will work.
Then repaint it or powder coat it.
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