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  With the nonstick coating, the inside is coated with nonstick material. With this treatment, the surface becomes repellent to liquid, resisting odor and stains by leaving less liquid on the interior of the bottle when emptied. SlickSteel┬« Finish is an electrolysis polishing method and not a coating. This method makes the surface of the stainless steel smooth, leaving less odor and stains, although not as effective as nonstick.