Protective coating "compound" for printed circuit boards operating in aggressive environments???

Question

Overclocking

Hello dear Toasters!!!
For many years I have been concerned about the topic of assembling a reliable (PC) that works with LSS / SVO , as well as with a phase transition system ( Freon ).
Why is the protection of the software from Moisture , Condensation , Spilled liquid (LSS depressurization), I think it is not necessary to explain .
There were many different options on the Internet, ranging from completely stupid and primitive (Coating with paraffin, car sealant, rosin, etc.), ending with special compounds (Nomakon-K3, Plasti Dip, ED-20 and an ooogrooomny bunch of others, which is already the head swells from diversity, and each has its own advantages and disadvantages, but All you need is to:
1. Good adhesion to PCBs (Printed circuit boards, metals (solder), ceramics, plastics.
2. Provided excellent: Moisture protection (from short circuit, as well as from condensate).
3. High-quality and reliable application, whatever: swelling, delamination, so that with a slight bend it would not peel off, would not break, applying it once, you could use it with confidence without fear (moisture, and the resulting condensate))))
4. What would have the best DIELECTRIC characteristics.
5. Chem. neutrally related to CEA (so that there is no oxidation and other negative factors).
6. It was possible to work at temperatures from -40 ... + 30С˚
PS: The problem of my search is that I don’t know how this or that compound will specifically lead, a huge choice problem (“Which of all the others is still the best, and will suit my requirements”).
I urge you to give an answer point by point, and a detailed explanation (comments).
I sincerely hope for your competent help.
Below are pictures and an article (for example)
https://www.overclockers.ru/hardnews/54767/Vlagoza...

Doctor lecturer 07/01/2013 12:40
But it's a good thing in case the pump leaks or the water cooling hose leaks. One word scares me - water in the computer! By the way, how reliable is water cooling and whoever had trouble with it?