On Youtube, someone posted a very nasty video who treated his laptop cooler (copper) with liquid metal, and where the whole thing eventually became insulating instead of conductive over time.
Someone explained it chemically (don't know if it's true). In any case, he said something like that the liquid metal combines/penetrates with the copper because of the particle charge, more and more over time, and thus actually irreversibly damages the heat sink.
Now my previous cooler was nickel-plated, but the Corsair AiO is pure copper. Now my question: What kind of weather is it in Shanghai right now? No nonsense, of course I'm worried about that now and since I just had to send it back under DoA warranty anyway, I'm now wondering whether I should leave it alone with a new cooler made of pure copper!

I would already assume that the warranty is gone...

Is the warranty gone if I open a laptop and paint the gpu and cpu with liquid metal again? My temperatures from the i7 7820hk exceed 95 degrees and today it often went up to 97-100 degrees....

In my opinion, it doesn't matter whether it's a laptop or a desktop PC. If you are running OC, I recommend using liquid metal, which dissipates the heat better.