Join Date: Feb 2014
I have been using Eezox as a metal treatment for firearms and edged weapons. It is a solvent coupled with a rust inhibitor; one can clean the surface of contaminants, and allow the remaining eezox to remain on the surface. The solvent evaporates and leaves behind an imperceptible coating of rust inhibitor. For long-term storage I then treat with renaissance wax.
I have had occasion to use Obenauf's leather protector on some dried and aged leather sheaths and ornaments. It has re-moisturised them to a degree, and probably will aid in their long-term survival, but it's only been applied for a year or two (one application in most cases; a second in some) so I can't speak to any longevity issues. (It has been remarkable in use on shoe leather and saddlery/tack usage).
I have access to silica gel, but I do not use it, as total elimination of humidity seems an extreme solution for anything containing organic material - leather, wood, ivory or bone. Keeping ambient humidity levels in the 40-50% range seems adequate.