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get it back down to bare plaster, and wipe it with vinegar and let it dry before you apply a GOOD TRUE alkyd primer. Coverstain is crap now and Kilz is worse. Sherwin Williams alkyd wall and wood primer, SW multi-purpose alkyd primer, or Pratt and Lambert alkyd multi-purpose primer are much better options. Ben Moore alkyd primers are good as well.

The moisture is activating the alkalinity in the plaster. Wiping it with vinegar will neutralize the alkalinity. (this is why you need to find a real paint store with people that know what they are doing instead of shopping at Home depot and Walmart for paint!)

Of course it is important to find the source of the moisture, and that may be difficult because it doesn't look like there is a great deal present. Make sure that you check for any plumbing pipes behind that wall that may have water condensing on them. I have seen that cause this many times in the past.
 
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