> Could you use a supported latex mold?  It would be re-usable too

Agree. I use it a fair bit (and silicone rubber - inert to almost=20
everything)

I also use a type of rubbery compound that has to be melted in a sand
bath on the stove as a quick and cheap substitute for silicone

Don't recall if this is the name but it's the same stuff

http://www.maragon.co.uk/vinamold.html

And laminating film can be deformed by heat, ovbiously, and won't
interfere with the epoxy cure. If supported it should do the job, but
I've never cured epoxy as high as 100C=20

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