We think we are experiencing mold on our ceiling due to moisture from the atmosphere when it rains. What is the best product to use for this?
Yes. That sounds like it can be a problematic situation.
When mold is coming through the paint, we assess where the mold is getting food from.
If the only way moisture can get into that ceiling is from the area being painted then we know it needs to be sealed.
If it can get moisture from above, the roof or elsewhere, then it probably should remain breathable.
Lime Prime on it’s own is breathable.
Lime Prime coated with Lime Seal will block out the moisture. Good luck!
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