On Thursday, March 9, 2017 at 2:22:05 PM UTC-8, Gramps' shop wrote:
Will West System 2-part epoxy freely release from a small silicon mold?

Hard to say. Usual 'mold release' is basically spray wax. Some epoxies will
dissolve small amounts of oil, wax, or grease (don't know about West Systems).
Some will even entrain water (so they stick to poorly cleaned surfaces, of course).

A bit of talc or graphite, if it sticks to the silicone, won't dissolve, and hurts
the bond. Or, maybe grease it and flour it like a cake pan.

Silicones aren't all the same, either; there's the polymerized dimethylsiloxane,
and some kind of filler. The filler might matter.

Start some trials, a little wax dissolved in paint thinner and applied with a cotton swab
would be my first experiment.