Eye lens material

Hello everyone! I've been thinking about the process of making eyes, specifically the casting process. I've had some experience with this although I'm wondering what people use for their clear outer "lens" layer. I made two moulds, one of which cast the inner core of the eye and the second mould was then designed to accept the inner core with a void between it and the mould to cast the outer clear lens. I used the crystal clear series from smooth-on and had pretty good results without polishing. I found on a test eye that the material didn't take too well to polishing and just went dull. Even though I'm happy with the eyes I produced, I'd like to experiment with materials which can be highly polished...does anyone have anything they could recommend? Below is a link to one of the eyes I made. Look forward to hearing from you! 



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