I was thinking of asking the forum for advice. I'm renovating a hallway with "pizzaputs", i.e., probably a gypsum plaster that is dabbed in a pattern and then painted with plastic paint or something similar. The peaks are probably up to 5 mm high. I tried sanding with an orbital sander and it went pretty well to grind down the worst of it. The idea was then to fill in the remaining unevenness.

But then I started poking at what was left. It came off quite easily. The problem is that the underlying plaster also comes off in places. But it can be removed.

My questions:
1. Is it best to fill over the pizzaputs or remove it completely? I'm thinking about adhesion, etc. It would be nice to avoid removing all the pizzaputs.
2. What type of plaster/filler should I use in each case? Does sand filler work, or is gypsum plaster better? Do you think I need to use bands to get it smooth with gypsum plaster?
3. What should I do with the outer corners? Does a steel profile need to be added there?

And no, installing renovation gypsum is not an option. I want to keep the moldings, skirtings, etc.
Close-up of a hallway wall with textured plaster resembling a "pizza plaster" pattern, painted in a light color.
Close-up of a textured wall with a pattern, likely "pizzaputs," showing raised peaks and a rough surface coated in paint.
Close-up of a textured wall showing "pizzaputs" plastering with raised, uneven surface and visible paint patches, related to a renovation query.
Close-up of a wall with textured plaster known as "pizzaputs." Part of the surface is chipped, exposing the underlying plaster layer.
 
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