I put RainX on my windshield about a week ago, and have gone through a couple rains so far. No issue with chattering. In fact, the wipers are smoother than ever. I did not put RainX in the section in front of the front camera though, but I haven't tried the auto wipers since they have been so bad in the past. This morning I was looking through the roof, and thinking it would be nice to do that next.