polishing resin?

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Heya- I'm casting resin in ice cube trays, and the ones made of hard plastic come out beautifully smooth and shiny, but the ones in flexible rubber moulds get funny marks on them and dont have a clear surface. I guess the rubber just has a weird texture that you can't see when you look at it or something. Can resin be polished? If so, what should I use?

The only reason I'm not just using hard trays is I've only been able to find them with a kind of 'nipple' in the bottom so they come out with this horrid distorting dip in them. While this can look cool depending what you're casting, as a rule it just looks very...ice cube. Oh so if anyone in the UK has a website/place that sells perfect hard ice cube trays that'd be ace too.

Thanks so much, sorry for superdull text only. I see a lot of resin stuff in the memories so I guess you guys would know!