I live in a warm climate with very rainy summers. I'm not reviewing this in summer so can't say for sure how well it will hold up when it rains almost 7 days out of 10. However, there have been a few rainy days since I've applied this and it still seems to work wonders. I have used products like Rain-Ex in the past and the results have been the same or even better. Another reason I was interested in using it is because I read that ceramic window coverings can help reduce car heat on hot, sunny days. Again, I'm checking this in the fall so it wasn't scorching heat outside, but it seems to have had a small impact on how hot my car gets when parked in a sunny spot. The app is pretty quick and easy if you wash your windows well first. Overall I'm very happy with it. It's not the cheapest remedy, but I'll take it again for a repeat before the rainy season starts.
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