Bubbled paint in bathroom?

Marlene asked 6 years ago

We primed our bathroom with Kilz and painted over the wall with semi gloss paint. As soon as one of us took a hot shower the new paint job bubbled. What is happening? Half the wall is regular drywall and the lower half of the wall is concrete drywall. Should we have use oil base paint? How can I fix the problem with out replacing the drywall?

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