Paint or wallpaper lime-cement plaster?

Whether you apply a diluted primer or use the TG doesn't matter. The TG and the primer are supposed to achieve the same effect. You can also dilute it with water. Namely, that the substrate no longer absorbs and the topcoat therefore provides a harmonious finish. It doesn't appear blotchy. That's the point. The paint also won't fall off the wall without a primer. What makes sense with new plaster is to lightly sand it once, because during hardening and drying it deposits sinter on the surface, which paint does not adhere to well. Karsten

Marvinius. The questioner seems to be able to distinguish brushes from rollers. And you are talking about spraying.

So classic. Gypsum plaster in the living areas, only lime cement in the 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 to tile too much, for aesthetic reasons. Therefore, wall putty, sanding. In the kitchen, where there was gypsum plaster q2, only filling of voids.,Then go on Tiefgrund. On this, fiberglass was 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 is apparently no longer available on the market. The result is scuff-resistant, washable walls. Similar to tiles. All other rooms. Voids filled. Stosil Putzgrund was rolled on and a texture brushed in with a ceiling brush. This stuff fills unevenness and is a great bonding primer for wall paints. On top, tinted wall paint chosen by my wife from Renovo. Ceilings after putty all in Stobasic old white. After several coats, every paint peels off.

We painted the lime cement plaster with interior silicate paint. (Diffusion-open) Two coats were necessary without primer.