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I have been told that Rain-X affect the durability of the glass that it is applied on - changes the molecular structure and makes it more brittle .Something to do with the surface tension apparently ?

My friend has experienced it before when his windscreen suddenly cracked for no reason. That stopped me from trying Rain-X out

It was parked under his proch and he suddenly heard a crack ( new car ) .Nothing could have fallen on it as it was under the porch, and it was a normal sunny day...