Here's a view of our installation from the inside of the car. It's easy to see that the original view to the rear is still quite visible, even when looking straight through. When looking from the driver's seat back, the louvered window opening has almost no loss of visibility to the rear. The instructions call for at least eight hours of drying time. During that time, it is imperative that the car doors not be closed abruptly with the side windows up. This could easily move the insert and break the seal. Once the adhesive has set for the required time, you can drive the car to check for wind noise and you may wish to test for water leaks with a garden hose. Once satisfied that there are no leaks, carefully reassemble the interior and enjoy your Mustang's great new looks.