We applied this to a sliding window in our office for privacy. Thankfully we could remove the panes for application, but even then it was quite challenging to apply correctly. Finish was easily scratched during application and many of the bubbles that were left despite our best efforts remained even after a number of days after it had completely dried. Also, the mirror effect is completely dependent on which side of the glass has more light. If both sides are evenly lit, like it is in our office, both sides can see each other easily, it's just confusing to look at. For the right application, I could see this being fairly effective, but it is difficult to install and doesn't look the most professional despite high levels of effort from us.
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