Nope - if you follow the directions you'll be fine. It's approved/recommended by pretty much every OEM car manufacturer. Unfortunately, there site appears to be down right now. http://www.valugard.net/cms/
Flatbush Brooklyn, I've lived here all my life. I like Queens, it feels less congested and on top of one another than Brooklyn. If you are ever in search of a professional detailer due to serious paint problems give me PM as I am fairly close-by.