I use rainx as well. No bad effects so far after applying it to one of my shoei shields for over a year. Some people say it can cause the shield to become brittle and crack because the rainx reacts to the anti scratch coating. I upgrade the shields for helmets I wear often every year. Since most of them get pretty good impacts over that period of time and I don't want to chance it shattering from too many hits. So I don't know about the long term effect and if that is true.
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