Color does not cover

Hello everyone, first of all even if this is not the right place. My name is Yves, I am 38 years old and have been pursuing my dream of building a house for 7 months. The whole thing is happening in the northern outskirts district of the capital. I need a tip on how to proceed further. After I had puttied and sanded the drywall sheets (I will never do that again, pushing a giraffe to the ceiling over 140 sqm is hard work. Hats off to those who do that every day) I applied primer 1:1 with a short roller. Everything was fine up to that point. Now I have bought a paint with opacity level 4 and started painting. Despite in my opinion very good paint, it does not cover properly. But only where maybe too much primer was applied (remaining drying). I tried diluting the spots with clear water, but apparently without success. The remaining drying seems to show through even after 2 coats of my own painting. What can I do to finally be able to paint opaquely? Regards, a clueless one

I guess you either primed too little or used the wrong primer. The paint is probably still being absorbed by the drywall. Is the wall plastered completely? Then you will probably need more primer, as the gypsum also absorbs like crazy.

After priming, we wallpapered with fleece, which then worked great.