Ceilings?

we have just painted our tolilet and bathroom ceilings as soon as the paint dryed it peeled and fell of, the ceilings are plastered and emulsioned over , we started again first painted it with glue but even that came off we scrapped all except the plaster off and painted again with a silk paint, parts blistered , please can you tell us what is wrong and what we have to do , we have done the ceilings in the hall and lounge which is the same but that never came off.
many thanks