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How did it go?

Hack out all the loose plaster and replace with plasterboard?

Hmm - I will check tonight, but if it does and I just make the new pieces at the same level will that work? When I looked at the picture it did look like the coving was quite far down the wall, but when you look at in the room then it's not obvious, so might just have been the angle I was...

So I had a go at this last night and although it’s far from perfect it might be close enough to fill? (There is no adhesive on yet, this was just me holding it up).

I think they are both British gypsum - I was left with some fragments when I demolished the cupboard and it had be same label on the back as the new stuff.

Ok, great - thanks guys - I think I have a way forward! Frist I will try wayners suggestion of cutting a RH internal mitre into the piece which is already in situ. If that goes pear-shaped then I just make a straight cut about a metre away and replace with a new length which I will cut a RH...

I think that would be a nighmare as I would need to keep the knife blade at 45 degress all the way through the cut?

I should mention this is a scrap of coving I am practicing with, so the left hand joint isn’t correct.

Pics attached

but how?

I need to fit a piece of coving with an exteral mitre on the left side and the right-had side scribed to an already fitted piece. (if that makes sense). I have read a thread on here about doing this with a coping-saw - but despite a few hours with a coping saw and sandpaper, I cannot for the...