Don't use any Neats Foot oil or Danner Boot Grease or anything like that on any vintage slings or holsters that you care about. Definately get the Pecard's Antique Leather Dressing and be sure to follow the directions. You apply a small amount at a time and work it in with your fingers and then let it air dry. Then when it is dry, you can put on additional coats. Then buff it with a soft cloth. This is the only way that you will end up a happy camper.