Just has hall resplastered...Painiting it using emulsion paint but some areas are bubbling even after resandin

Question

new plastered hall, 2 coats of white sil emulsion followe by coloured emulsion, but certain areas are bubbling, Ive sanded them back after drying, put when painting, seems to get air under the paint any ideas ???

the plasterd was completed 6 weeks ago,

Answer 1

It could be the paint is too thick so thin it down just for that bit.
OR if that doesnt work< thin down an OIL BASED PAINT and use that and then the emulsion over it.
hope this works.

Answer 2

Sounds like it was a solid wall, did you have the bonding coat changed as well ?

Did you have it plastered for damp problems.

Sounds like salts are coming through the plaster.

You should have removed any plaster that was subjected to damp in order to stop salts seeping throuh the new plaster.

If there was no damp previously, then perhaps the wall is too cold. Try heating the room up before painting. Hopefully you sealed the wall with a PVS or weak emulsion solution.

You should only be using silk paint on a bone dry wall. If it is a board skim, then it should be dry by now, but a solid wall can take months.

Answer 3

It sounds like you have not given it sufficient time to dry out.Wait at least 2 weeks and then use a diluted white emulsion to seal it.Dilute the paint with a ratio of 1 part to 3 parts water.You can use two coats of this then apply the colour of your choice.Allow 8 hours between coats.Works perfectly every time.Good luck. Just read your update.If the plaster has been on 6 weeks then it`s because you did not thin the first applications.You must do this first.

Answer 4

Haa you have made the mistake of not letting the plaster dry properly and then not using a propriety sealer to finish of the plaster.

The bubbling is cause by salts leaching out of the plaster and causing the paint not to ad-hear to the sub surface. The only cure is to sand back to the plaster, then use sealer, then allow to dry then repaint, sadly for you you may well find that all the new paint work you have done, will bubble within a few months

Answer 5

I see the problem straight away, you have used silk, and you must not use silk over new plastered walls.
What you should have done is to apply a miscoat (thinly watered down coat of matt), whatever anyone says never use PVA on new plastered walls prior to painting either.
Then apply another coat of matt, again watered down, but not as much as the first/miscoat, then you could coat your walls as normal.
Now you have used silk, you will never get the walls right unless you either scrape off all the silk, or really go mad and sand the whole lot, to get rid of the silk, and start again with matt.

A few months down the line you can apply the silk if you wish over the matt, but for now get it off.

If its too hard a job sanding all the walls, you can either line the walls, or invest in 'dulux' primer sealer, which is oilbased, and would have to be thinned with white spirit as its very very thick, and stinks to high heaven, and apply that to the walls, leave to dry for a couple of days, and start again with Matt.

The last option is one I have used also, but not on as big an area as you have, is to buy some cheap oilbase undercoat, and put that over the walls, and then wait till dry and start again.
again stir the undercoat and thin, and dont roll too thick on walls, and just watch out for any runs.

any of these methods will work, just depending on which one you choose.

Answer 6

you need to seal the walls with a sealant, I think its called Unibond. Had the same problem a while back and that solved it for me. Just put it on with a roller as you would when painting and you will find the paint will go on without any problems. Happy painting.

Answer 7

just sounds like a sanding sealer need be applied????
not being there is the prob.
but I'm sure you have the paint sucking up and bubbling back so a sealer may be necessary to stop sucking in.
also check the component makeup of the applications, are you using a water paint over a oil or visa versa moreover.
that happens to me when i do door staining with wtr base and cover with verathane of oils

Answer 8

Leave it for a couple of weeks. As it cures, plaster gives off carbon dioxide. It needs at least two weeks before you can paint it.

Answer 9

That same thing happened to me..I was told by the plaster/drywaller that i should have waited 2-4 weeks to paint..To make sure the plaster was dry
Good Luck

Answer 10

You should have put a sealer on the new plaster before painting