"Earlier, Empire23 came up with a simple method to weatherproof camera lenses. Now he has a guide on weatherproofing your trusty tripod. This guide is based on a Gitzo tripod with ALR and G-Lock collars, but the same principles apply to other tripods.
Of course, tripods are far more rugged than camera lenses, but they can get damaged from exposure to salt water or sand. In addition, as your tripod ages, the grease dries out, which may cause unwanted wear and tear. Therefore, it is always a good idea to re-grease your tripod even if you do not expose it to hostile environments."