DIY help: fresh paint on ceiling bubbling and peeling

[rachelinindia]

Painting my bathroom today. Get to the last section of ceiling immediately above the shower and when I applied the paint with a roller back and forth a huge air bubble appeared which peeled off!

Am I right to wait for everything to dry, scrap off any loose paint in this section, prime/seal the plaster underneath and then re paint? What’s the best primer for a bathroom?

The bathroom does have a fan and window which is always left open so hoping it’s nothing more serious...

I think it has done this because you didn't apply a "mist coat" of diluted paint to the new plaster beforehand. Or if you did, it wasn't dilute enough in this very warm weather. Where ohh go from here though? Ask goodbye, I would; I guess you just have to scrape off what is left / loose and seal it properly, allowing it to dry before you have another go.

Try this: www.bidvine.com/blog/painting-new-plaster/

I wasn't painting directly onto the plaster just repainting over old emulsion but the peeling has taken off everything back to the plaster itself.

At least it's a small area and shouldn't be too much extra work to put right!

I would imagine the previous owner didn't use a mist coat in that case. The mist coat is liquid enough to soak into the plaster and give the proper coat something to grip to. Regular paint will just sit on the surface of the plaster and potentially come off - as it has now.

I've had this. I had a pot of paint that wouldn't stick to walls or ceilings.
A different brand worked.

I would prime it with a PVA solution and paint over it when dry.

Thanks both for your advice

please don't put glue on any surface that you hope one day to paint.

PVA is water-soluble so it softens when emulsion paint goes on it. It softens again in wet or steamy conditions. It prevents the paint from touching the plaster, therefore it does not soak in or stick to the plaster.

Some plasterers used to recommend putting glue on plaster, but most of them have now been killed by angry decorators.

A mist coat is what you need on bare or new plaster and patches.