Tools: Utility knife
Neat wallpaper edges on arches can be achieved, by attaching a plastic edge trim around the edges of the arch. Make a number of cuts to one side of the plastic edge trim so that it adjusts to fit into the arch curvature.
Next, the plastic edge trim is glued with contact adhesive onto the outside corner, the edges are sanded smooth and filled with a filling compound. The wallpaper can then be cut neatly and easily along the length of the profile trim.
The curvature of the arch can also be papered directly with Go/Pro non-woven fabric.