Questions about Liquid Pro Liquid metal

Hi, yes but you have to be extremely careful because it is conductive, it can also create warranty problems, because it eats away at the cpu and gpu and besides that it is important to use a proper heatsink, there are materials that in contact with this thermal paste are ruined, they have a kind of erosion.

I did not sand down my CPU, which worked perfectly. It is important that it is as clean as possible, for which a cleaning cloth is included.
As I understand it, the enclosed "sanding material" is to clean the CPU when you want to remove the liquid metal again, as this dries out and becomes hard.

Fixed, but I'd go with Thermal Grizzly Kryonaut today because with liquid metal you have to grind down the CPU. I found that quite tedious

No, the Alpenföhn has heat pipes made of nickel-plated copper.