ᐅ Treating interior plaster with lime-cement plaster

How should interior plaster (lime-cement plaster) be treated before proceeding with the following applications?

- painting
- wallpapering

What exactly is the difference between primer and sizing?

I would recommend priming the surface with a deep-penetrating primer; it is relatively inexpensive and quick to apply. Another advantage is the fast drying time.

Using a lining paper is advisable for wallpaper to ensure the seams hold better. However, if you plan to paint and then wallpaper, it’s better to treat everything with a deep-penetrating primer. This also improves the durability of the wallpaper because the plaster becomes saturated, preventing the adhesive from being absorbed too much by the plaster.

Regards,
Sandy

Fresh or new lime gypsum or gypsum plasters, regardless of what will be applied on them, must be primed with a deep-penetrating primer. If wallpapering is planned, a brush- or roller-applied lining coat should be applied first to ensure adhesion for the wallpaper.

Hello,
I would also recommend treating it with a primer, as new plaster absorbs moisture very strongly, meaning you will need much more paint without it. It is also important that the substrate has dried long enough; I would say at least 6 weeks.

Hello,
I had a wall in my house replastered, and the painter advised me to wait for 6 weeks before applying anything on it. I followed this advice and then wallpapered. I just used a bit more paste and didn’t do anything else, and everything is holding perfectly.

Hello,
I did the same with the wall; I waited 6 weeks and then painted it as usual. I didn’t notice any difference when painting. However, my wall has a gypsum plaster finish, so I’m not sure what type of plaster you have and whether that makes a difference.