At last years Wing-Ding a vendor was selling Aquapel as an alternative to Rain-x (which we cannot use) on 1800 windshields.
Rain Repellent Glass Treatment - Aquapel Glass Treatment
I bought one of his bottles, and applied it to my face shield, and because I'm a coward I got a scrap windshield, and put it o there also.
That windshield has been sitting outside "in the elements" since wing-ding 08, with no damage, or yellowing/cracking that was apparent with Rain-x products.
I called Aquapel today and asked them about the ramifications of using AQ on polycarbonate.
They gave me this response...
The engineer I talked to is inthe process of sending me a letter stating as such.Originally Posted by Aquapel
This was verified by my "test" shield, and face shield, that have had NO damage since I applied it in 08.
I am going to get another treatment and give it a shot...
Just thought you all should know...