Bringing this thread from purgatory even though it's a wee bit old.johnblaz2000 said:The best thing to do is to wrap Teflon tape around the O-ring enough times to get a snug fit when you place the bulbs back into the housing. This will prevent any under sized after market fog lamp bulb to not allow water to get pass it and into the housing. I wrapped mine about three full wraps and noticed a snug fit and no problems yet. Try not to wrap no-where close to the base of the bulb so you don't have to worry about burning the teflon. The bulbs heat over two hundred degrees so be careful of what you use. I know that the Teflon works and I will stick with it.