Cool Coolin' System, well, is it?

1. I use some agent (prefferably in spray) that is thermo-conductive and doesn't conduct electricity to cover ALL parts of the computer (mobo, GPU, CPU, RAM).
2. I submerge the whole thing in a tank filled with water (or oil)
3. If the above works I will think about next step. But will it work?

And I don't need no advice to buy an additional fan instead of that. I just wonder...

Answer:
Yes it will work to the extent that you can the get the heat out of the oil or water...in other words you will eventually heat up the liquid. So you need to circulate it or some how cool the liquid by exposing it to air or other. Seems like a complicated way to cool something...
Waft your fanny. Tosser.
Or you can do what super computers do and use a non-conductive coolant :)
yeah, you're onto something- but water is usually a bad idea with any electronics. Look into a liquid thats non-corrosive and doesn't conduct electricity.
if you manage to locate your super agent, which is waterproof, thermo conductive and not electrically conductive it would be a reasonable start to a cooling system but would have 1 major drawback: component replacement will become nearly impossible.
generally you lose a single component rather than the entire PC becoming unusable all at once, with the thermal goo you will be unable to replace spot failures so your PC will will be useless if one key component fails.

Water cooled cooling systems normally just enclose the heatsinks and pump coolant around the key components that will need cooling, this route is much better in the long run.
Many (many!) years ago on UK television there was a science program called "Tomorrow's World." One of the items that always stuck in my mind was a demonstration they did where they completely submersed a mains powered TV-set into a bath of liquid, while it was still running, without getting an electric shock or causing any damage to the TV.

Obviously the liquid wasn't water; unfortunately I don't remember what it was, but it was clear, non-volatile and totally harmless to skin (the presenter had her hands in the tank while the TV set was in it !), liquid at room temperature and a 100% high-voltage electrical insulator. It must have been thermally conductive too, otherwise the TV set would have overheated almost immediately.

If you could find out what it was you could try it !

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