I understand.
Then it all comes down to the viscosity of the thermal paste. If it's too thick, then it won't fill an unpolished surface, it will leave air pockets.
If it's too thin, then it still works very well, because it does still get rid of the air pockets.
If the surface is sanded to 600-800, the paste will fill the gap, and if it's polished, then the gap is still filled.
The problem may come from an unusual process by which the surface is polished, where the surface is like a mirror, but microscopically, it's a weird kind of flat, and the paste doesn't work very well.
Does that make sense?
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