yea i kno there is alot of threads out there that explains this but everyones says different things. Butyl Rubber, Silicone II, etc..... Lets get it straight.. If you have condensation or fogging problems, what is the best to use?? Also if you blackhoused ur headlight, what is the best to use to prevent this? It would also be good if you tell us what you used to reseal ur headlight and how it is working now.