noun
protective film; protective coating; overcoat
Refers to a thin layer applied to a surface to protect it from damage, corrosion, or wear. Used in technical and everyday contexts.
スマホの画面に保護膜を貼った。
I applied a protective film to my smartphone screen.
この塗料は金属表面に保護膜を形成する。
This paint forms a protective coating on metal surfaces.