On external gypsum corners, I always at least put a corner bead before plastering (the kind you moisten and glue on).

I am now going to make a curved corner according to the picture. On the wooden wall, I will use a regular 13 mm gypsum, and on the underside, there will be a 6 mm renovation gypsum, about 100 mm wide. 6 mm is easier to bend.

However, it becomes a delicate edge that I would like to protect. Is there a smart way to do this?

Wooden staircase with an exposed curved wall corner. Wooden planks are visible, showing preparation for drywall installation. Sunlit room with bookshelves in the background.
 
There are self-adhesive corner guards that you can glue on. You could cut a "V" into the molding on one side so you can bend it. Keep the other side intact along the underside. Then you putty the whole thing. It should be stronger than just drywall. And you minimize the risk of cracks. There should be some movement in the staircase.

Corner guards come in various types, with self-adhesive or glue that you dampen.
 
  • Self-adhesive corner guard with perforated metal strip and protective red tape for construction projects, designed to minimize crack risks and add strength.
  • Self-adhesive corner protector made of perforated material, designed for drywall installation to prevent cracks and enhance durability.
M Mr Lorentz said:
There are self-adhesive corner protectors that you can glue on. You could cut a "V" into the strip on one side so you can bend it. The other side you keep whole along the underside. Then you spackle the whole thing. It should be stronger than just plaster. And you minimize the risk of cracks. There should be some movement in the stairs.

Corner protectors come in various types with self-adhesive or glue that you moisten.
Exactly, I always use corner protectors as I wrote. Maybe your idea of using V-cuts could work.
 
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