Like everyone said, if you keep the old material in the little valley of the light and use a heatgun to reseal, you shouldn't need anything else, no silcone or the nissan stuff.
I've done this on 3 cars, it's worked every time. THe ones on my accord are the worst, one will lightly fog after a wash. So only with a ton of water, and it goes away in an hour or so. But using a heat gun makes this alot easier.