Why chalky spots appear on wall?

Karen asked 4 years ago

I recently painted one of my son’s bedrooms and months later there are chalky spots appearing in different area of the wall. We used a latex multipurpose interior primer before we painted. This happened a few years ago when we painted this same room. That’s why we thought we should prime before painting. I did not have this effect with the second bedroom and we used the same paint for both rooms, semi-gloss.

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