Quote Originally Posted by David Lyga View Post
...Vaseline...
My experience with Vaseline (coating battery terminals on my car) is that it runs like the devil. Something you want when water/acid-proofing terminals and stranded wire, but something I would think you don't want when dealing with lenses. I would opt for some hi-tech silicone grease that stays where you put it. Shouldn't cost a fortune, if you look at an industrial supply company instead of some specialist optics supply place.