Smart film instead of curtains?

[markthegrea]

For those of you that sleep in your trucks when overlanding, have you ever considered using Smart Film on the windows?

Amazon product ASIN B0BGG9KG69
Couldn't you put this on your windows and with a flip of a switch, make the windows opaque?

 

[captainva]

Those are usually not perfectly clear unless built into a window and also don't go fully opaque. I wouldn't want it on the front windows since it will affect visibility

 

[markthegrea]

Does anyone have experience with this stuff? Seems in the back it could be very useful.