Crumbly newly plastered wall

[bighenk]

Hello! I plastered a short wall in the basement with plaster mortar B several weeks ago. And what you see in the video is occurring in several places. If I continue to drag my finger, I dig a hole.

Should a plastered wall really be this soft? I'm disheartened because I wanted a smooth and nice wall...

Can I skim coat the wall to fix the unevenness? The wall is in the basement

 

[Jansson69]

Hello! Several weeks ago, I plastered a short wall in the basement with plaster B. And what's shown in the video is occurring in several places. If I keep rubbing my finger, I make a hole.

Is a plastered wall really supposed to be this soft? I'm disheartened because I wanted a smooth and nice wall...

Can I skim coat the wall to fix the unevenness? The wall is in the basement.
[video]

How did you go about plastering?

 

[bighenk]

Used a plaster spray to apply the plaster, which I then pulled off against the screed bars. It was relatively thick, so I plastered in 3 rounds. And used a sword to even out the surface.

 

[Jansson69]

Used a plaster sprayer to apply the plaster which I then leveled off against the screed tracks. It was relatively thick so I plastered in 3 stages. I used a trowel to smooth the surface.

How was the watering before and after? To my knowledge, plaster should be scrubbed after leveling with a float to work it together...

 

[bighenk]

Watered several times before and a few days after with a couple of hours in between, but scrubbing brings out such a rough surface. But do you think it couldn't hold together because of that? But then it should still be harder deeper in the wall. But it isn't, is it?

 

[bighenk]

Is there something I can apply now afterwards to bind the material together and is there something I can use to smooth the surface afterwards without worrying about problems if the basement is a bit damp?