Re: the ESC heat issue - silicone is actually a good conductor of heat, so as long as air can circulate (the spacers sound like a good idea) then it might actually help dissipate the heat.
Silicon rubber, the kind that you buy in the hardware shop or instant gasket etc. produces acetic acid. Test it on a piece of metal and see what happens. I would not put that stuff anywhere near your electronics. There are specialized thermally conductive epoxides designed for that job.
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