You just need to keep using it. My shell had a matte feel when I first got it but its now very slick. Give it a month or so of regular use and it should sheen up. Don't worry about minor oil smudges, unless its bad chemical stains they won't even be noticeable in the future. ^Guitar2013, my shell wallet gets wet all the time because I hike in the rain and it doesn't seem to affect it at all. It's not waterproof but it dries back to its natural sheen.
11/13/14 at 4:30am