Hi! I just found your message, hope Iam not too late! I used Fiebings leather stain that I purchased from The Cobbler Store over on e-bay. I am attaching the link. I first cleaned the holster very thoroughly using isopropyl alcohol. After the stain dryed I applied several coates of neutral shoe polish and buffed it out with a brush. I polish it with shoe polish, usually neutral as I dont want boot black all over my clothes, about every 6 mos or so.
Link to e-bay store:
http://www.ebay.com/itm/Fiebings-Pro...item6fc5e739bf