Blistering paint (Ed.)

[rhysjc]

Hi everyone

I’m really in need of some help here. I had another thread going talking about the primer on my walls blistering, and then an issue with blistering on the ceiling. @Wayners has been incredibly helpful there but I think I’ve found the root cause, on the ceiling at least.

I had some more peeling, applied some Peelstop and then noticed that was bubbling underneath. I started scraping that away and it’s just coming off in sheets now back to the original plaster. Not sure how far I need to go with this and how I can remedy it?

 

[Wayners]

Get it off.
Bodge cheap orbital sander on vacuum with 120grade mesh disc.
Spot fill and sand.
Gardz
Paint.

Original emulsion has failed

 

[rhysjc]

Thank you @Wayners again. By get it off do you mean the whole ceiling? It’s probably 6 layers of paint coming off here, right back to plaster

 

[Wayners]

Yeap.
Toolstation
Product code: 61276 plus 29412

Those blades aren't the correct ones but deeper and wider. Go easy and be careful with it please.
Correct angle and going slowly so you don't dig in. You really don't want to damage surface. Takes a bit of practice but when you get the it right paint comes off easy. I guess I have had years of practice on a price.

I'd get it' off. I don't know of another way other than board over and skim

 

[rhysjc]

Thanks. The walls don’t seem to have the same issue which is odd. Or maybe I’ve just don’t gone at them hard enough.

I’ve been having luck scraping it off with one of those 7 in 1 tools. One question @Wayners , if I’m scraping back literally the entire ceiling, what is left to sand and fill? Or are you suggesting eventually I might get to a bit that’s stuck down? Honestly not sure how I’d go about filling an area that large

 

[Wayners]

I can see yellow paint in picture on ceiling
I think it was called cream. I've seen that before many times.
Is that chalky?
Will it was off?

 

[rhysjc]

Yes there are bits of it in patches. It doesn’t seem to be coming off on the back of the sheets that are peeling off though which is a bit odd. I wouldn’t say it’s chalky. I have dust on my fingers if I touch it but that’s true of the whole ceiling

 

[rhysjc]

Actually scratch that it does seem to be coming off on the back. It’s pretty crumbly whereas the other layers of the paint are holding together

 

[rhysjc]

Also @Wayners don’t suppose you know why the plaster is grey? I was expecting it to be brown

 

[rhysjc]

Hope I’m not breaking any spamming rules here, but I think I’ve figured it out. I believe the ceiling had calcimine on it. The new layers of water based primer and paint have softened it up and it’s lost adhesion. I’m not sure if the walls also have it but they’ve been skimmed over at some point, so shouldn’t cause me an issue now. Plan is to scrape it all off, sand smooth, use Gardz as wayners suggested and then hopefully paint for a final time

 

[Wayners]

I was thinking it's distemper. Everywhere in 1960s houses in a cream colour. Walls and ceilings.
However you say it's been skimmed so I'm unsure what's happening as I can see what looks like it in your photo. Why is this cream paint on ceiling if it's been skimmed?
If you skim over distemper the plaster won't stick. I used to mechanically sand off distemper, Sbr or gardz. Then skim.
First there was lime wash. Then distemper in 50s and 60s which would not rub off on your clothes. Then vinyl emulsion
Contract Matt is a bit chalky though and I've had emulsion peel off that which Is probably what you have.

 

[rhysjc]

Sorry @Wayners think that’s me confusing things. The walls have been skimmed, I don’t think the ceiling has. My plan today is to scrape it all off, sand back anything that’s not come off and then put some Gardz on. I don’t have the skills to skim, do you think that’s necessary here? Surface is very smooth as is

 

[securespark]

Also @Wayners don’t suppose you know why the plaster is grey? I was expecting it to be brown

Some plasters are grey, some brown/ pink

 

[JohnD]

How old is the house?

How did you clean the surfaces before painting?

Did you apply mist coats?

 

[rhysjc]

The house is about 100 years old, maybe slightly under. All surfaces were sanded and sugar soaped. We didn’t apply a mist coat as we didn’t have any plastering done on the ceiling, but we put 2 coats of very cheap primer on the whole room