holster and leather protection

[Johnny Peppers]

I have some slings that were treated with mink oil over twenty years ago, and a white substance still forms on them periodically. It is not mildew as they are on rifles kept in a gun vault that has a goldenrod heater for temperature control. They sit alongside slings treated with Pecards that do not form the white substance. I also have Model 1916 holsters that were treated with mink oil at the same time period that are stored in airtight containers that do the same thing. They have shown no deterioration, but look like hell until they are wiped down again.