Rounded internal corners - plaster wall

[Tony O 1977]

Hi,

I am redecorating a downstairs loo and planning on wallpapering one wall (Large mural type thing)
The corners of the plaster are rounded though. (Internal corners I mean)
How do I go about making these into actual 90deg (..who am I kidding..aprox 90Deg) corners again ?

Is it a case of breaking out the chisel and chipping it out and re-doing the corners?
Thanks

 

[Lower]

You need a plasterer to come and fit corner beads over the top and then skim.

 

[Tony O 1977]

I would go down that route if it was external corners to get that nice clean edge , But as this is internal (ie angling away from the inside of the room)..air freshener can for reference I'd hoped to sort this myself.
Is that a really bad idea?

 

[Lower]

I would go down that route if it was external corners to get that nice clean edge , But as this is internal (ie angling away from the inside of the room)..air freshener can for reference I'd hoped to sort this myself.
Is that a really bad idea?

Sorry, missed the fact that it was internal corners.

In which case, yes its about chipping out and remaking the 90 degree corner which sounds like a bitch of a job and something i'd get a plasterer to do

 

[Tony O 1977]

Dang..
I was afraid you'd say that

Thanks mate

 

[bsr]

How about wallpapering half way round the corner and using a trim to cover the edge?

 

[Tony O 1977]

Not sure that would work there really.
It's looking like hammer chisel and my dictionary of swear words

 

[Nozzle]

Or an SDS drill with the correct bit and setting.

Nozzle