Get bumpy wall/grainy wall smooth?

[AndreasFrågar]

Recently bought a new apartment and a smaller storage room has a very rough and bumpy wall that feels quite uncomfortable. I would like to make it smooth and even... but don't know which method is easiest.

Got a suggestion to use some kind of renovation wallpaper, but I think it will be difficult to get it to stick? The other options were to put up panels/drywall?

But I'm considering if the cheapest and simplest option would be to use some kind of filler in the room. I've never filled entire walls like that, but the room isn't that big... so maybe an amateur could manage it?

Does anyone know what it's called, this coarse strange thing that's on there now? Looks more like it's meant to be on the outside of a house.

 

[AndreasFrågar]

The room is approx. 2*1 meters, so quite small.

If you are going to plaster such a large area and make it adhere directly to the wall that is there now.
What type of filler and method should be used then?

 

[Stefan1972]

There is both wallpaper and plaster that looks like that, so first check what it might be.

 

[AndreasFrågar]

There are both wallpaper and plaster that look like that, so check first what it might be.

It's not wallpaper... and it's very hard. Someone said it was a h*ll to sand down. So I'm thinking it's better to put something on top instead.

 

[henche]

We had such a wall in the basement lounge, was paint with something mixed in. It was extremely tedious to get rid of... ended up scraping it down hoping to avoid replastering the wall. I skipped replastering but you can see scrape marks.

Do you know what the wall is made of? Plasterboard?

Besides renovation wallpaper, there is renovation plasterboard, perhaps that could suit this case.