Paint or wallpaper lime-cement plaster?

It used to be said never to paint damp rooms extensively with latex paint, as moisture in the walls would no longer escape, which means a risk of mold. There are now probably latex paints that allow more diffusion, I would inquire about that.

Man, I’m feeling totally different now... Lime plaster is exceptionally absorbent, elastic, and antiseptic. A good material.

"Some" primer can very, very easily contain acrylate, it is more likely than unlikely.
Latex paint differs from dispersion paint by the higher content of pure acrylate in aqueous solution. Acrylic can, even in high dilution, very well form a thin film over the good properties of lime, then you have this fabulously encapsulated and could have saved yourself the good stuff right from the start.

My suggestion would be to stay in the system and continue working with mineral material. Primer, for all I care, with silicic acid. Making a wall "appetizing" with diluted paint is an old and proven approach. Paint mineral. You have to wait a bit longer for coverage when drying and also for final strength.

The whole "paint" fair is always full of products where you can, without expertise, apply everything on everything and preferably in a single layer. That’s better not to imitate. Anyone who only has to finish a single object and for themselves should do something good for themselves and avoid physical experiments. Most of it sticks to the wall anyway somehow, but it can be done better without additional financial effort than annulling lime properties with acrylic. By the way, the plasticizers in acrylic off-gas for the entire product life. You can do it, but you don’t have to.

Best regards

Gabriele

So, back again, I was completely mistaken. We only have lime-cement plaster in the bathroom and guest WC; in all other living rooms, we have gypsum plaster.

What should one pay attention to regarding primer and interior paint for gypsum plaster?

What does it look like if one has painted over it several times years later? Does the paint eventually peel off? Is there a difference in this regard between expensive and cheap paint?

Best regards
Nancy

So classic. Gypsum plaster in the living rooms, only in wet rooms lime-cement. Almost everyone does it that way. Since my brother is a master painter and therefore probably professionally okay, I'll tell you what he did with me.,[Bathrooms and kitchen]. We didn’t want too many tiles, for aesthetic reasons. Therefore, wall filling, sanding. In the kitchen where there was gypsum plaster Q2, only filling of blowholes.,Apply primer deep on that. On this then glass fiber glued, Sto tex. On top Stocry. Silk matte. Commonly called latex. But in the end it is an acrylic paint; real latex made from rubber apparently no longer exists on the market.The result is scuff-resistant, washable walls. Similar to tiles. All other rooms. Filled blowholes. Rolled on Stosil plaster primer and wiped in a structure with a ceiling brush. That stuff fills unevenness and is a great bonding base for wall paints. On top, tinted wall paint according to the wife’s choice from Renovo. Ceilings after filling all in Stobasic off-white. After multiple coats every paint peels off.

So classic. Gypsum plaster in the living rooms, only lime-cement plaster in wet rooms. Almost everyone does it that way. Since my brother is a master painter and thus probably professionally competent, I'll tell you what he did with me.,Bathrooms and kitchen. We didn't want too many tiles, for aesthetic reasons. So wall putty, sanding. In the kitchen where there was gypsum plaster Q2, only putty dents.,Apply deep primer on it. Then fiberglass was glued on, Sto tex. On that Stocry. Semi-matte. Commonly called latex. But it is basically an acrylic paint; real latex made from rubber apparently no longer exists on the market.The result is scrub-resistant, washable walls. Similar to tiles.
All other rooms. Putty dents. Rolled on Stosil plaster base and wiped in a texture with a ceiling brush. This stuff fills unevenness and is a great bonding primer for wall paints.
On top, tinted wall paint of the wife’s choice from Renovo. Ceilings after putty all in Stobasic old white.
After several coats, every paint peels off.

Our procedure for Q2 surface: First sand, then putty, then apply fiberglass fleece wallpaper. In the basement cheap Modulan, in the living rooms a pre-primed fiberglass fleece. Then applied dispersion paint using an airless device. Went very fast and looks good