Making a corner on a curved plastered wall

[Rkv74]

Hi
My builder has just applied multi finish plaster to a wall that is straight but then angles away. However the wall looks hideous as he has not made straight edges and instead has turned the middle section of the wall into a curved corner. View media item 69040
How can the builder turned the curved wall into an angled wall with straight edges?

please help

 

[roy c]

He could of put a stop bead on and skimmed to that....

 

[Rkv74]

Thanks for reply. What us a stop bead and how would this work?

 

[Reeves2k2]

Thanks for reply. What us a stop bead and how would this work?

A stop bead is like an angle bead but doesn't have the 90° return it is just flat and is used and intended for non 90° angles exactly like this

Would have made the edge perfectly straight and sharp

 

[plasteringpaul]

As above stop bead....