Help! Didnt seal plaster before we painted

misgrace

ellie1379 wrote: »

thank you for all your replies and advice!

so as long as i am careful with the masking tape i shouldnt have any problems with the paint coming off in the future?

i have just had another look and there is one very small area of peeling but thats it.

I suppose my main concern is that the peeling could get worse once I have put the 3rd and final coat on and then i have given myself extra work if I have to strip back to the plaster again to seal it.

thanks again

hi ellie, the trick with masking tape on painted walls is never to put on straight from the roll, as its far too tacky (as in sticky)
Just tear strips off, put them on your jeans, or old work trousers, peel off, put back on, peel off again, this will take away the stickyness, but still leave enough stickyness to stay on the wall, when finished, remove tape, and you have no peeling paint.

keystone

misgrace wrote: »

Everything else you said is okay, but the above is rubbish advice,

For once Missg I have to completely disagree with you. Its not rubbish advice - thats far too genteel. Its totally utterly barking mad.

never use PVA even diluted on new bare plaster :eek:

Quite and it doesn't matter how many times you say it people will still peddle this nonsense.

Cheers

keystone

spadoosh wrote: »

Work in diy retail.......

Oops - you have no idea how worrying that statement is when connected to your advice to use PVA. PVA is a nono because it doesn't sink into the plaster it just sits on top. When the next coat of wet paint hits it it goes live again and there is no bond between paint and plaster so it peels at one stage or another.

Cheers

Barneysmom

We've had our stair wall, an outer wall, stripped back to brick this week. The plaster came yesterday and put pva on the bare brick then put the thermaboards on top.

The painters are in today or tomorrow to put a coat of magnolia on, so I'll watch and see if they put pva on first and make sure they don't use it. I'm not expecting them to, it seems wrong.

nearlyrich

Just been involved in a total renovation of a house which involved new plaster in a lot of rooms, we used Crown matt white (2 coats) before the colours on new and older plaster and the finish is excellent.

ellie1379

well i guess i will just crack on with the final coat and keep my fingers crossed i don get any flaking! have learnt a lesson for next time too

thank you for the advice re masking tape too - very useful tip!

RichiebB1969

I got some flaking and used a mix of white paint and PVA (white) glue 50/50 as a base. That worked well and there is no peeling on the areas I treated.

But then again I was working with white walls which made things a lot easier.

dave82_2

If the paint you are using is taking 3 coats to cover it is probably watery enough as it is!

The issue with painting straight onto bare plaster is that the plaster sucks the moisture out of the paint. Becasue it dries out too quickly it doesn't get a proper key onto the surface and can end up pealing or flaking.

The normal process is to add water to the paint so it doen't dry out too fast this is called a mist coat.

Like people say not much point it worying about it now.

I would however like to say don't go anywhere near fresh plaster with PVA! It stops the paint keying onto the plaster properly and you will probably end up with the same pealing issues. Not to mention it makes it a heck of a lot harder to get the paint to adhear.

I don't know of one single paint manufacturer that says anywhere that you should treat new surfaces with pva! All you are doing is forming a barrier between the plaster and the paint so the two aren't bonded and you rely on the PVA holding up.

Did I mention you shouldn't use PVA?

cyclonebri1

Without reading all of what came before, the issue is that plasterers like to produce a mirror/shiny finish to their work :T,

But that's not good from a painting point of view as it will not absorb standard grade emulsions.

So, the 1st coat has to be diluted, I go 50/50.

Looks crap and slapped on but it has to be done,
Next one same stuff neat,
Then the colour of choice,
Then possibly another coat the same,

It will all peel at sometime, just makes it easier when decorating properly.

PS,
A wallpaper steamer makes removing wrongly applied emulsion so so easy;);)

Ebe_Scrooge

cyclonebri1 wrote: »

Without reading all of what came before, the issue is that plasterers like to produce a mirror/shiny finish to their work :T,

I had that a few years back when we had a room re-plastered. It was like glass when he had finished ! He did tell us to give it a very light sanding with very fine sandpaper after it had dried, before painting. I must say, though, I was impressed with the finish he achieved :-)