Personally, Polish books is overkill if all you want is to update the metadata in the book. There is also "Embed metadata" that does it. And whenever you send the book outside of calibre (send to device or save to disk), the metadata and cover will be updated. If you want the jacket, then Polish books or a conversion is needed, but as the Kobo devices can display most of the metadata, it isn't needed as much as for other devices.
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