Bathroom Ceiling Bubbling
This is quite simple. Let him / them sort out the issue the way they see fit 
. Before any work commences, explain to them that if the issue returns, so will they, at their cost, to repair it again.
The PVA is used to get adhesion, and not to create a barrier. If the new plaster isn't allowed to completely dry out prior to painting this will go full circle.
Plastering over PVA also requires two coats of skim in the same set ( minimum ) as the PVA tends to cause the first coat to bubble up, and is then nigh on impossible to trowel to any reasonable finish, hence the requirement to go over the top of the first coat with a second 'top' coat as a finisher.
PVA gets reconstituted with water / moisture so ensure this new plaster has time to fully dry with the room getting as little steam / use as possible during that period. If you have to shower, window open, and then door open straight after to ventilate the room. The fan alone won't be sufficient. It would be a very good idea to hire a dehumidifier, but don't be tempted to use that until the plaster has gone light pink. Some nuggets will say that's dry, but it's not fully dry, as in dry enough to paint with a non-breathable paint.
Lastly, I'd look long and hard at the paint you choose to apply. Go for a top quality paint which is vapour permeable if possible. I for one, would never use a silk paint in a bathroom, but that's your choice, and would instead use a scrubbable matt paint like the Dulux Diamond range. That again is dependant on what is over the other walls already and how far your going to go with this. 
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Tell them the buck stops with them, and the problem won't go away, and you will pursue them if it's not resolved in the next visit.
Source: https://forum.buildhub.org.uk/topic/3035-paint-bubbling-in-bathroom/
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