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://www.letsaddsprinkles.com/2023/06/the-powder-room-redecoration.html?showComment=1747830954547#c6862970323612976350