Q3 putty painted vs. wallpaper in terms of sensitivity

Yes, but harder to work with (slaked lime is caustic), probably not so optimal for DIY and there are hardly any craftsmen left who are interested in it. But if you can do it yourself, of course it's great. You can also create surfaces that almost look like marble.

I have craftsmen who do that and are also very reliable. I am not worried about the execution, only about the product properties themselves.

Then they can't deliver Q3 either.

There are supposed to be people who slap plaster filler on there. It's stupid, but I would claim that 80% of the builders don't notice or don't know.

No, the processing is almost comparable to gypsum. Lime smooth finish can also be processed mechanically.

So, what I used was already thicker than the plaster filler I used. However, that was already pre-mixed, so maybe that's why.

I have craftsmen who do that and are also very reliable. I'm not worried about the execution, only about the product properties themselves.

Well then you don't have to worry. Just maybe make sure they also use lime smooth finish and not gypsum.