Which smooth plaster for interior use?

My statement quoted by you referred to the circumstance and later also in the thread basis that builders plaster and paint their walls themselves.

Ah, own work. I had missed that context, so you are right.

Drying times of screed can indeed be accelerated using chemicals (e.g. from Lanxess®; but please don’t ask me for the name, I would have to admit ignorance)

Indeed, there is a product called Mebofix. How exactly it works is not revealed. But on the web, Lanxess provides quite informative information about factors influencing drying (h t t p : / / Anhydrit.de/de/Service-Center/faq/konventioneller-calciumsulfatestrich/). The additive probably improves the pore structure (pure speculation on my part). Obviously it’s chemistry, but IMHO no witchcraft, nor a disadvantage. On the contrary: those who build faster build cheaper. I think the bigger lever for drying (of screed) lies in the proper combination of heating and ventilation.

(Now I first have to find out whether our developer wants to use flowing screed or conventional ... Especially since I have just gotten to know the breakdown in another thread ...)

I saw the lime-cement plaster live for the first time today and have to say that I am quite impressed. Of course, you have to look at everything again in daylight when it is dry, but so far it seems very smooth.

In any case, it is a crumbly matter. Therefore, we cleaned over it again. Thin and with the same structure. Thus, nothing crumbles anymore and painting was easier.

Why crumble? Nothing should be crumbling

We also had a meter of wall plastered so that the connections can be made. I was also very pleasantly surprised at how smooth the plaster is

At my parents' house, there has been [Gipsputz] for 30 years and so far I am not aware of any problems with it.

Why should they? No one says that...