I looked into resin because it can be easily cast and tends to have a transparent finish with a fast drying time. Although, it is mot malleable, which is the most important characteristics of my bottle and so it would't be appropriate.
EM310PA CLEAR RESIN 1KG + CATALYST (CR10029)
A silicone would be more suitable because it an elastomer and so it is flexible, and it is semi-transparent.
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