I bought both Stoner's Invisible Glass and Rain-X today, but I was wondering if I can these two together. Do I need to? If so, which one should I apply first? And after maybe a few weeks from applying them, when I want to wash the car again, could I by accident wipe these chemicals off? How long should it be before I reapply them? Also, can I use these products for the sunroof (inside and out) or do I need something special?

Thanks for your time.