Yes, most films provide 99-99.9% rejection of UV rays. As referenced in causes of fading question this represents 40% of the cause of sun related fading. The other 50% that can cause fading is attributed to Visible light and Heat.
Dependent upon the level of heat rejection and Light transmission of a film you can expect to pro-long the life of your furnishings and flooring up to 2.5 to 3.5 times when applying film.
Note nothing short of sheetrock will stop fading completely.
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