Ko-Cho-Line can be used on metal to prevent rusting.
Ko-Cho-Line Leather Dressing by Carr & Day & Martin is a unique, thick, pink grease that protects leather from mold and mildew when in storage. Ko-Cho-Line Dressing will not rot stitching and can be used on metal to prevent rusting. This specially formulated conditioner can also be used to renovate and revive tired saddles and strap goods. Not suitable for aniline or untreated leather, suede or nubuck. Test on a hidden area before use.