Products from turtlewax, nufinish and even meguiars all have silicone. I've seen claims on this board that silicone will cause your paint to chip and peel and/or that you will never be able to repaint your car etc. Nufinish in particular has gotten a bad wrap because of the misinformation over the use of silicone.
No. In fact, automotive paints worldwide contain silicone as an ingredient to help the paint to spray and flow more smoothly.
All quotes are from meguiars faq on the subject. http://www.meguiars.com/faq/index.cfm?faqCat=General%20Questions&faqQuestionID=19§ion=_19
The fear and confusion surrounding this single ingredient, silicone, is an ongoing problem people run into when they get caught up in the hype and misinformation spread from person to person, generation to generation and now-a-days, on the internet, which exaggerates the problems surrounding the use of silicones in car care products. There are some sources that even go so far to say that silicones are harmful to paint. This is not only dishonest; it calls into question the credibility of that resource and any and all claims they make. Silicone is inert. It cannot harm paint, let alone anything else it is formulated into, or sitting on top of, especially in the form of a coating of wax.