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Painting & Decorating

Shading and uneven wall surface after painting

I've painted my stairwell walls after first sanding them - they had a "fluffy" film on and had lots of small imperfections which I filled in. After putting one coat of white emulsion and, a few days later, one coat of Dulux washable paint the walls have a very shaded and patterned finish. There are also some very visible rough patches in places. I prepared and painted walls in two other rooms in my house in the same manner and they turned out perfectly. What can I do to remedy the stairwell walls? It doesn't look like just another coat of paint will sort it out. I was advised in a DIY shop to apply a sealant and then paint two coats of emulsion. What do you advise? Many thanks.

9 Answers from MyBuilder Painters & Decorators

Maybe try rubbing down, dilute a coat of paint down by 25% and re paint wall, then rub down wall with 280 grit sandpaper and re paint sail wall with 10% diluted paint.
Please make sure you remove all dust from the wall each time after sanding.
Good luck.

2020-03-08T09:10:02+00:00

Answered 8th Mar 2020

Without looking myself it is hard to judge but I would suggest a sand, clean and seal as it may have distemper on the walls

2020-03-08T09:10:02+00:00

Answered 8th Mar 2020

Before you painted, and after you filled and sanded, did you ensure that you removed all the dust/debris from the walls? Also, after you filled the holes/cracks, did you ensure that the place where the holes/cracks were had become invisible?
Were the walls a darker colour than the white you put on? If so, you may simply need to put another coat of emulsion on, ensuring that you fill the roller well and cover the whole wall evenly. Sometimes uneven areas are because the previous coat was not sufficiently dry or because of poor rolling technique that "stretches" the paint too far, leaving uneven patches.

2020-03-08T09:10:02+00:00

Answered 8th Mar 2020

It may be the light on the uneven wall showing the imperfection of the plaster, if the wall is uneven, I would lightly sand and use a washable or durable matt finish so the light doesn't reflect off the paint as much. if not uneven I would use a fine grade sandpaper to sand rough patches then thin the paint down with a little water for a smoother finish
Thanks Andrew

2020-03-08T09:10:02+00:00

Answered 8th Mar 2020

It sounds as though lining paper or plaster might be an option. You could also try a high opacity paint as an undercoat.

2020-03-08T09:55:02+00:00

Answered 8th Mar 2020

Hang 1200 grade lining paper.

2020-03-08T11:40:02+00:00

Answered 8th Mar 2020

Sounds like there was a wallpaper on there prior so it would of needing sealing as the paste is reacting to the normal paint.
Seal walls resend and paint.

2020-03-08T14:50:02+00:00

Answered 8th Mar 2020

Emulsion breathes but when wet contains water draws salts in the underlying surface could be lime leaching out known a efflorecens salt deposit needs to be dusted off until it stops coming out of the wall otherwise you may have seal the wall with alkaline resiting primer which doesn't contains oil not water this seals it from any water activating the lime out of the wall but very often stops but could still bubble up the surface that sealed if water gets into it again

2020-03-08T20:15:01+00:00

Answered 8th Mar 2020

If there is rough patches, then these need to be dealt with by sanding down, walls may need sealing before painting, as the paint can sometimes react to any underlying materials on the walls, This can be done by using PVA solution, Zinnser self levelling paint or even the walls could be lined with 1200 grade paper as this will hide a lot of defects, and then provide a suitable surface for new paint. You need to weigh up cost / effort / finish you are after.

2020-03-14T07:55:02+00:00

Answered 14th Mar 2020

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