Wall Papering newly plastered scimed wall and cieling

keep room ventilated and wait untill the plaster is a light pink colour all over proberly about a few days depending on thickness .

Once the plaster is drying you will see a uniform pink all over it there still dark patches then it's not ready yet keep it vented

Wait until the plaster is a light pink in colour and looks the same all over.make sure the room is well ventilated.prior to papering mix a thin solution of paste and size the walls i.e. Paint walls and allow to dry thoroughly before starting.