Nickel acetate sealants were intended to be used where the size of the work or the way they are racked makes boiling water impractical. Boiling water or steam sealing is actually superior and is much more chemically inert.
I'll say this again because its important; you must have enough boiling water and heat available so that the boiling doesn't stop (ideally doesn't even slow down) when you immerse the parts.
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