I put this stuff on my windows of the collection room last year.
KESPEN Window Film One Way Reflective Daytime Privacy Heat Blocking Anti UV Mirror Window Tint for Home and Office, Tea-Silver, 35.4 Inch X 6.5 Feet https://a.co/d/fa6mQ6w
It definitely darkens the room and helps with cooling. But can still see outside, but makes it look like your looking through sun glasses, as expected.
Kinda hard to make any definitive statement on fading since that’s usually so gradual you don’t notice it until you have a non-faded item to compare. But assuming it’s claim of blocking 95% uv rays is semi-true, it would definitely help.