Lumpy plaster at the top of wall

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I'm decorating a room. After stripping the wallpaper from the walls and ceiling, on one of the walls there was a long crack in the joint between the ceiling and the wall. I've attached a photo.

I filled the cracks with pollyfilla. However, there is lumpy plaster at the top of the wall. I don't know what caused it. Maybe it was subsidence which caused movement between the wall and the ceiling.

The problem is, if I leave it as it is then there won't be a good finish for the wallpaper because it will be lumpy underneath. I haven't tried to remove the lumpy plaster because I thought it might weaken the ceiling plaster as the lumpy plaster seems attached to the ceiling plaster.

What would be the best way to remove the lumpy plaster to get the wall flat without weakening or removing parts of the ceiling plaster?

Could using a drill be a good option? Would that be better than using a hammer and chisel?

Thanks for any advice.
 

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i wouldnt drill or hammer and chisel it.
may be better off filling over it and rubbing it back smooth.
does it feel loose/weak?
 
i wouldnt drill or hammer and chisel it.
may be better off filling over it and rubbing it back smooth.
does it feel loose/weak?

No, it doesn't feel loose or weak.

In what way do you mean filling over it? Do you mean put filler under the lumpy plaster?
 
how old is the house?

I can't see the scale, but you could put coving over it.

I can't see the lumpy plaster in your pic, but if it is in a straight line along the wall about three inches below the ceiling, it is probably where there is a wooden wall plate that has been plastered over, and might have been repaired when it became loose or cracked.
 
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how old is the house?

I can't see the scale, but you could put coving over it.

I can't see the lumpy plaster in your pic, but if it is in a straight line along the wall about three inches below the ceiling, it is probably where there is a wooden wall plate that has been plastered over, and might have been repaired when it became loose or cracked.

The house is 1930s.

Coving goes around the whole room? I don't think I would want coving.
 
If you are going to paper the wall, very few people will climb up a stepladder with a torch to examine the top of it.
 
No, it doesn't feel loose or weak.

In what way do you mean filling over it? Do you mean put filler under the lumpy plaster?
fill over the top of the lumpiness with a wide spreader. spread down from the ceiling. then smooth it off with sandpaper.
 

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