I applied to the sensor and then put it up on the window. Unfortunately, as many others have described this is basically a regular maintenance item. They need to be replaced about once a year for me. Particularly if the car sits in hot summer sun. But I like how it works, the pads are inexpensive, and they are really easy to replace.Do you apply tape to sensor and then sensor to glass, or tape to glass then sensor to tape/glass? Haven’t received the new tape yet so curious how it looks.