What causes blistering/bubbles in paint?

blistering bubbles causes paint
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What causes blistering/bubbles in paint?

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Moisture is the problem. This is not the paint or the painter. The solution can only be found by tracking down the source of the water. To scrape or blast off the surface and prime and paint will not prevent the problem. It will reappear. When the moisture problem is found and repaired the wall must be allowed to dry thoroughly before painting can be done.