Keep those camera o-rings and all your other o-rings well lubed. This if food grade silicone grease for all your lubing needs! And this comes in a crush proof screw top container, not those cheap flexible ones that always leak out in your Dive Bag or Dry Box.
There are many reasons for using lube. Some like to spray it on their gear to keep the materials soft and from drying out. If this is what you are after, then I would take a look at the McNett Silicone Aerosol Spray