Paint peeling after underoat

Question

I recently moved into a new house and started preparing a wall for painting. I noticed the old paint was peeling easily, coming off in large sheets when rubbed. I removed all of the peeling paint, applied an undercoat/primer, and then painted the final top coat. However, the new paint is now peeling in the same way, even after using the primer. What could be causing this issue, and how can I ensure the paint adheres to the wall properly?

Paul · Answer

It sounds like the previous person/Decorator who painted the wall did not correctly prepare the wall.
It is likely it was fresh plaster and the plaster was not sealed correctly and they have gone on the wall with a silk / durable matt / bathroom paint,  And although it initially dries and sticks to the plaster, overtime, it will separate itself from the plaster and just sit on top.
There could be another reason though, and that damp is behind the wall, but you would probably notice that with stains / water marks and the plaster being crumbly…
Unfortunately, the best way to solve this is the scrape all of the affected wall, or at least all of the areas where the dried paint comes off… fill and sand down any areas required then apply 1 or 2 coats of Zinsser peel stop, then paint as normal - as long as there is no damp condensation issues in the wall, then it shouldn’t peel again.

Hope this helps
Paul
Decor & DIY Services

Jaroslav · Answer

If you use PVA to your colour that will make the colour much more stronger, it makes the colour to be like a plastic on that wall.

Nigel · Answer

The undercoat/primerneeds to be mixed with water 50/50 so it soaks into the plaster to seal it.

James · Answer

It's usually because if the previous person painted over fresh plaster without watering down the first coat which we call a miss coat that's the reason you can buy a product called peelstop which you put on over the walls use brush not a roller as it will drip everywhere as it's very watery after the suggested time frame you should be OK tompaimt over online a product called guardz for this problem or peel stop

Andrew · Answer

Hi Ryan that's a strange one after a mist coat - theres a product call peelstop which works as a bond and should work for the above 👍

Hayley · Answer

my opinion is sand the wall down first so the the paint has something to bond on to, it may also be too damp in the walls or from the plaster could not of been set properly.

Martin · Answer

What I would do from my experience is to sand down the area, then apply a pva solution 3 part water 1 part pva then undercoat and paint. This has never failed me.

Ethan · Answer

I suggest, stripping all paint again with a mechanical sander to make life easy. Then apply a base coat of contract matt paint, leyland would do I suggest white. Let this dry. Then apply a solid coat of cover stain. Then apply a coat of damp seal. Then purchase a mostuire resistant walls and ceilings paint, wickes have a great range. Apply two coats gently. By the sounds of this this is a moisture problem. If this does not work this could mean the plastboard is compromised, and it might need to be re plastered. Good luck!

Merlyn · Answer

Hi there,


I am sure you have a damp problem in the wall which first needs to be addressed otherwise you will have a recurring problem. 

After inspection and treatment for damp,We prefer to use an oil based primer before applying a water based emulsion top coat of paint.

This flies in the face of the normal golden rule of painting which is to keep undercoat the same solvent (ie oil based primer & with oil based top coat or water based primer with water based top coat) 

This is the exception to the rule as an oil based primer is designed to accept both oil and water based top coats.

The reason we do this is that an oil based primer seals the  wall better and adds to adhesion of the top coat, so in cases of damp it adds extra durability to the final job.

you are welcome to contact us for further info.

Kind regards,

Merlyn Jackson T/A Mint Projects

Usman · Answer

There are two reasons first in this wall moisture and in this case part of this wall plaster board to remove and other one is this first sand the wall then put one coat of oil paint after one day put final coat.

Paint peeling after underoat

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