Hello,
I am painting the walls of my apartment. The old paint is dark, and I want to paint it white now. I am using white paint from Alpina.
The paint does not absorb well into the walls.
When I apply the white paint, the roller slips on the wall, and the old paint is still visible after painting.
Should I paint 2 or 3 coats?
Or do I need to use a primer first (see in picture 2)?
How can I repaint my walls?

I am painting the walls of my apartment. The old paint is dark, and I want to paint it white now. I am using white paint from Alpina.
The paint does not absorb well into the walls.
When I apply the white paint, the roller slips on the wall, and the old paint is still visible after painting.
Should I paint 2 or 3 coats?
Or do I need to use a primer first (see in picture 2)?
How can I repaint my walls?