Help with bathroom ceiling

[usn90]

So the paint on my bathroom ceiling started to bubble and peel off, so I scraped off the loose bits and sanded the edges, I then painted over using dulux bathroom paint, however 2 weeks later it’s started to go again, even in places it wasn’t originally.

My initial thoughts are I didn’t leave it long enough between coats, and possibly the room was subjected to moisture too soon, so I’ll have another go.

One thing though, is that when I painted the first time there was a clear layer difference between where I painted over the existing paint, and where it was the bare plaster, how do I overcome this? - is it a case off building the paint up where it’s just plaster first, or should I be using something else there first?

[miniman]

Get it sanded smooth then prime it with something like Zinsser Peel Stop https://www.zinsseruk.com/product/peel-stop/

[CorradoTDI]

You'll need a specialist product on that like Zinsser Peelstop

https://www.toolstation.com/zinsser-peel-stop-prim...

[Lotobear]

You've got moisture in the plasterboard as the original paint was vapour permeable.

I would scrape as much as you can off and then try to dry it out as best you can then apply an appropriate Zinsser primer before painting

[usn90]

Thanks for the suggestions, with try the product.

I’ll try banning the shower/bath for a couple of days before I start, hopefully dry it up, easier said than done in a full house though, that been said we are having another bathroom fitted downstairs next year, would have been easier putting off this job till then but it just looks a mess, and I’ve no idea if the plaster could be getting damaged by just leaving it.

[Baldchap]

What's the ventilation situation in there?

[bennno]

It is plasterboard or plaster?

If its plasterboard then be careful with the sanding suggestions = that will just trash it.

[OutInTheShed]

Baldchap said:

What's the ventilation situation in there?

Also what's happening above the ceiling?

If those downlighters are letting steam through, the plasterboard will be getting damp from above.
I've changed a load for 'fire rated' models which are pretty well sealed between the room and the loft/void above,

Painting over a coat of paint that's not well stuck to a substrate is generally doomed.
I would start by scraping off anything loose with a sharp blade.
Then prime the ceiling with something penetrating, like dilute exterior PVA or waterbased polyurethane. Make sure it's dilute enough not to go glossy or you'll need to sand it for subsequent paint to bond. Ideally get paint on within a day or so, before the primer cures fully.