I have a newly built house and I'm evaluating how to proceed with the painting of the rooms, to define what I can do myself and what has to be done by professionals.
The ceiling is already spray-plastered, it looks rough and nice.
The walls are of two types: concrete (outer walls, grey) or gypsum (inner walls, yellowish). The builder used plaster to make the bricks uniform, that means that he used it only or almost only in the joints between bricks. There is no thick layer over the whole walls as I was used to see in the past.
I have NO drywall.
See for example the following two photos (one has been taken before the ceiling got plastered).
Some corners (see the second photo) are visibly darker where the roof has been sealed last.
My plan was to spray a primer all over the walls (not ceiling) and then go with one (ceiling) or two (walls) coats of latex paint.
I was suggested that plastering the whole wall may be a better option, to improve the ability of the wall to absorb and release humidity and to provide a better surface. Also, one coat of paint may be enough if the surface is already white.
What are the advantages and disadvantages of plastering? should I do it?