When the surface becomes matte, start smoothing it out with a spatula. Before wallpapering, prime the surface and wait until it dries completely. Glass fiber wallpaper should be glued with a special glue for glass fiber wallpaper, i.e. with increased adhesive capacity. This can be ready-to-use glue or dry powder. https://ivebo.co.uk/read-blog/147078_the-importance-of-bathroom-layouts-in-house-design.html