I'm intending to use the product inside my bathroom for privacy. The window is located inside the shower tub area. I'm concerned about the longevity of the product in a high humidity environment. How

Both adhesive and static cling films can be installed in humid and moist conditions. If being installed on a shower door, mounting on the outside of the shower door is recommended. Detailed specifications for this product are available here: https://www.decorativefilm.com/mm5/graphics/00000001/2017%203M%20Tech%20Data%20Sheet%20w%20NEW%20FILMS%20and%20Install%20Guide.pdf