After multiple attempts to adhere this to my Toyota Camry's rear window, it would not stay put. In fact, it fell down every time within only a few minutes and before the car ever moved. Not only is this obviously a safety hazard, but it annoying as all get-out. Since I cannot seem to find a suitable rear window shade that actually works and isn't a safety hazard, I am investing in window tinting - an expense I was hoping to avoid.