Interior walls and ceilings - differences Painter's fleece with fiberglass

We have mineral interior plaster on the walls (lime-gypsum plaster as far as I know) which was actually applied well and is really good for Q2. The ceilings (Fiigran ceiling) on the ground floor are also very smooth. In the attic, we have drywall panels.

I actually want to leave the walls relatively "open" and use the plaster as a moisture regulator (as far as possible) (we have a solid Poroton house). Now we have the opportunity to obtain a painter's fleece that is reinforced with fiberglass. However, it is not a conventional painter's fleece but is used for the boarding of interior ceiling elements. It also seems quite "robust." My wife would now like to use this for the walls and ceilings, but I'm not quite sure if this material is suitable for this purpose.
I am currently wondering what makes a painter's fleece a painter's fleece? What distinguishes the fleeces from each other? Especially with fiberglass content. What should I pay attention to when gluing the product to our walls? Can I, as a layman – independent of product sheets (which I unfortunately do not have) – test whether the painter's fleece will negatively affect the room climate? I took a sample with me.

Can I, as a layperson - regardless of product data sheets (which unfortunately I do not have) - test whether the painter's fleece will negatively affect the indoor climate?

Don’t ever use it! Your walls will no longer be able to breathe. Irony off. Basically, it doesn’t matter at all to you what or whether you put anything on the walls. Only taste decides – not the indoor climate.

And which glue would be suitable for a fiberglass fleece?

Wallpaper paste?

...colloquially speaking, plastic-reinforced glue. If the properties of the (semi-) mineral substrate are to be preserved, mineral paint should be applied. Lime paint or clay paint, for example, there are also a few more options but those are the classics that always work, are available ready in a bucket, and are easy to apply. Of course, you can't splash lime around, it eats away.

Best regards
Gabriele

Fiber optic is a tile substitute. You glue with a dispersion, then you paint latex and the wall is sealed. Like a tile.