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By fll-freak
#120867
Reynolds advanced products sells all kinds of amzing materials.
http://www.reynoldsam.com/

I have made numerous molds from silicon and cast with various resins. With a proper release agent, there is nothing from keeping you from casting rubber button covers.

Now trying to get them to spring back from accordian folds in the rubber is not likley to happen. Put a cover over the mechenical buttons is very possible.

Rebound-25 is a nice product. I was able to cast LEGO bricks that would snap to real LEGO. I was also able to add bronze powder to a plastic resin to make a faux bronze sculpture. It might be the case that the bronze creates an electrical circuit. Would have to check