It’s what I’m most worried about, we have to replace all the windows from our 50s era house. So it’s getting switched anyhow, but he’s envisioning the tub on the north wall with the window. It currently has the obscuring glass in the bottom, but I don’t like it very much. I haven’t seen much on how definitely water proof the film is. Which is what worries me the most if I go down this route. It sounds like it worked well for you though, thank you!