Acrylic joint ceiling / wall in new construction - When to seal?

Good evening everyone!

I wanted to quickly inquire about the sequence for the acrylic joint between ceiling and wall in the new building.

The ceilings in our new building will be wallpapered with painter's fleece and then painted white. The walls will have a fleece wallpaper (partly patterned) that does not need to be painted afterwards.

When is the best time to create the acrylic joint between ceiling and wall?

I would assume the following sequence:

- Wallpaper ceiling with painter's fleece
- Apply acrylic joint between ceiling and wall
- Paint ceiling white including acrylic joint at the edge
- Wallpaper walls with fleece wallpaper

Yes, the procedure is correct. However, it will still crack in 6 months or sooner, again and again.

And what am I supposed to do about it?

Nothing, as long as the house is drying (about 2 years), it actually makes no sense to do anything. You can redo it now and then and observe. If nothing cracks anymore, then the house is dry and you can do it properly.

But one should still apply an acrylic joint, right?

Stick on a molding strip