My chips are not casino chips. They are Dale Seymour coded Antique chips and chips similar to that. I have been using Mineral oil for a couple of years and am very satisfied. The other thing I have heard about is Vitamin E but have never tried that. My bottle of mineral Oil will last longer than I am around.
I put Mineral Oil on my chips and usually let them set over night and wipe them off the next morning, then let them dry for another day.