Bathroom Ceiling paint keeps peeling? Very pitted

We have a problem with paint peeling in our bath room. Because of the peeling we painted it just one year ago. 4 months ago it was badly peeling again. 80% of the ceiling was pitted and bubbled up. The one wall by the shower head had bubbled up and a few minor paint peels on the wall by the window. My main concern is the ceiling. I would say 50% of the spots peeled all the way to the bare plaster. Some of the peels had water inside. So we scraped it thoroughly, patched the divots, used a latex primer, and then painted 2 coats of mold resistant latex paint. Now after 4 months it is starting to bubble up again. The house is only 30 years old. I only have that problem in the bath room, so I assume it is a moisture problem. Would using oil based primer have a more lasting effect? I notices when I applied the latex primer, it would not paint on very thick, as if it was not adhering properly. I don't know why, because I sanded everything really good. My question, is there a way to fix this problem without having to install a fan? I would be happy it the painted lasted at least 1-2 years (there is a chance we will be selling the house) without bubbling up.
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short answer, no.

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if too thikc, it fell off? or does teh surface of the plaser peel away wiht the fresh, wet paint?
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no, the plaster does not peel off, it is in good shape. just the paint peels off

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1. You need an exhaust fan in that bathroom, if you have one you need to replace it with one that works at moving the damp air out the room. 2. You need to remove as much of the paint as possible and wash it with something like ammonia, then leave the ceiling to dry out for a couple of weeks without using the shower. 3. Then prime the ceiling with a good quality primer, and coat with a couple of coats of a good quality paint. 4. An alternative, which I have tried successfully, is to wallpaper the ceiling with a heavy white cloth backed vinyl wallpaper. You apply the pre-mixed paste to the ceiling AND to the wallpaper back with a paint roller before installing.

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