20 Feb Can you apply an additional adhesive film to an existing one, e.g. on a door?

This is generally possible. However, the surface should be as smooth as possible (e.g. no chequer plate film) and free of dust and grease.

If the bottom layer is a PP or PE film (polyolefin), for example, the adhesion will no longer be as strong as on other surfaces.

If the film is applied to an existing PVC film, it will no longer be easy to remove at a later date because the films form a strong bond.