ᐅ Painting work: which type of paint, with or without non-woven wallpaper?

When a wall dries, it loses water and, therefore, volume. However, in our walls, cracks have appeared since July in exactly one spot. Why is that? I think there is hardly any water in the Ytong masonry due to the adhesive. The plaster on top is not thick enough to handle shrinkage without cracking. An exception is the cable channels. There, the plaster is thick, which tends to crack. Let it dry out, apply a quick-drying filler, repaint, and done.

I have two vertical cracks below two windows, nothing else. Aerated concrete blocks.

We also have Q3, although that is always quite subjective... our walls are very smooth, gypsum plaster, and even with raking light you can’t see any unevenness. We had them painted right away, but with silicate paint; I wouldn’t want to apply dispersion paint on the walls. We only used fleece on the ceilings, as otherwise you can find a few small cracks here and there.

Hello Lumpi, why did you choose silicate paint instead of dispersion paint?

This is certainly also a matter of personal belief.
Gypsum plaster can quickly absorb large amounts of water vapor and evenly release it again, which leads to smaller fluctuations in humidity (for example, when cooking, many people in the room, etc.), contributing to a comfortable indoor climate.
Using dispersion paint removes this property from the plaster, which simply doesn’t make sense.
Then there are the additional benefits, such as being fungicidal...
And quite subjectively: when comparing two sample areas, silicate paints simply look better.

The downside is (at least according to the painter) that you shouldn’t paint this yourself. If you don’t know what you’re doing, it quickly becomes blotchy and uneven, making touch-ups almost impossible, and the paint isn’t particularly health-friendly during application either.

We will be using lime gypsum plaster. Is it possible to paint over it with silicate paint?