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How do you make gelatin (Jell-O) and make it flexible and pliable instead of being soft?

I want to give it a rubber-like texture — somewhat firm yet flexible, pliable, and doesn’t tear apart. In this case the gelatin does not have to be edible, just functions as a rubber substitute. ( I got no transparent silicone RTV liquid available for molding so I’m thinking I might give gelatin a try.) Thanks.

Less water. Try half as much as the instructions say.

Just a tip, if you are using it as only a rubber substitute and not to eat, if you buy a box of knox gelatine powder it is cheaper and doesn’t include all the extras. You just need gelatine.

Moldmaking With Clear Silicone Rubber