If you attach film on the outside, you should make sure that the temperature is not below 5 degrees.
Sun protection film can only be applied to gas filled windows and sloped roof windows from the outside, otherwise the glass could break.
Sun protection film should never be stuck on only parts of window panes, since this would cause stress cracks and thus breaking of glass, i.e. a window pane must always have sun protection film stuck on the entire surface!
(This does not apply to translucent film, decorative film as well as UV protective film!)
