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Hmm. Interesting.!
Are the molds cooled somehow.?
Most epoxies create heat of some degree, through chemical reaction to each other.

And how much hardener you add.[emoji38]

I would worry...

Rez seems to have you covered, with taping the flats of the inside part of the scales.

As to keeping them from sticking to your work surface, there are two ways that come to mind, that I use.
1....