ᐅ Is it allowed to apply paint directly onto plaster or drywall?

Is there any reason not to paint the interior walls directly? Normally, wallpaper or a paintable wall liner is applied first, but is it possible to skip that? Painting directly is much easier and looks perfectly fine.
What if I want to wallpaper over it later—would that still be possible, or would the wallpaper not adhere properly to the paint?

You can also paint interior plaster directly; depending on the product, it may be necessary to apply a primer beforehand. This ensures that the surface does not absorb too much paint.

Whether wallpaper will later adhere to the painted surface is uncertain; with silicate and clay-based paints, I would say yes. However, with synthetic resin emulsions, there can be layer separation, which would negatively affect the adhesion of wallpaper.

You may have seen during renovations that interior paint can come off large areas of walls – that is the issue.

I think plaster can be painted easily, although I would apply a primer first because of the wall’s absorbency, and then paint over it.

With drywall, only paint after all joints have been properly filled and sanded, and again, be sure to apply a primer. However, the seams between the panels will still be visible, so using a textured wallpaper would be more suitable here, with paint applied on top.

I have also applied the paint directly onto the plaster. It is important to prime the surfaces beforehand. Otherwise, it works wonderfully. So with clay-based paints, wallpapering afterwards is not a problem.

I have already tried that as well, and the color on the plaster looks great. After some time, we also applied wallpaper to part of these walls. That was not an issue either.

I tried this a few years ago as well, but I didn’t like the result. The plaster absorbed the paint, causing dark stains to appear. Since then, I first prime the interior wall and then apply two coats of paint. Although this requires extra effort, I prefer it and it also lasts longer.