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Agree with others: Oil based Kilz should cover it.
Also, Kilz makes a ceiling stain primer and paint in a can. My MIL bought some for an old water stain in one of her bedrooms. I had low expectations, but the stuff worked amazingly well for about 3 minutes of work on my part.
Was it as good as a fresh painted ceiling? No.
But it covered the stain and blended so well you really had to look for it.
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