What fishbum said...

Salt on tying materials is a huge mistake!

Letting the skin dry with the salt is not a problem, but the salt MUST be washed out before the hair gets used for fishing.

The only point I have a mild disagreement with in fishbum's excellent post is the borax use only in fly season... I always use borax and often tumble skins in borax and sawdust to clean and polish it after washing.
art