i had good luck with a high voltage divider i made (i think 60 10meg
resistors in series and a shunt across the meter terminals, all on
perfboard in a plastic box) that i potted in paraffin wax from the
grocery store, so i think it would likely work for most low power
electronics, but i doubt it conducts heat very well.

David Minkler wrote:
>
> Ake,
>
> Some of the glues become (noticably) conductive over time (and
> temperature).  The origin of my suggestion about waxes came from the
> fact that boards and individual components were frequently coated with
> waxes (beeswax maybe?) as conformal coatings in the days before silicone
> or acrylic conformal coatings (say, the 50s and early 60s).
> Additionally, I recall that core and coil neon light transformers were
> often encapsulated in tar (quite a mess and smelly too).
>
> Regards,
----------

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