Re: What to use for potting transformers.
The Parmeko Neptune series are liquid (transformer oil) immersed of course. But prices for those these days make conductive polymer look cheap ! I don't think any DIYer works with oil unless he absolutely has to. It's not just the liquid spillage issue. Getting the best out of it involves stopping it absorbing atmospheric moisture. And there's also the smell ...
(Voice of experience - from the early 80's to the late 90's I was responsible for various bits of oil-immersed kit, peaking at about 15 tonnes of the stuff.)
Cheers,
GJ
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