Depends on the size of windows and how fast you can move. I can hit all the windows on my mustang before it dries up, however the fusion I can get the front/rear windshield and the driver side window. After that I can only get a little on the passenger side and the 2 rear get nothing. The most important is the front and rear windshield as the rest can get a sealant application (I prefer opti-seal).