It's called thermal paste. And yes it will.I also was advised to get some resin for my heat sink as the blockage in the beginning causes some nice burn and must have affected the old resin that was on there. Not sure if that would make the heat sink more effective at dissipating heat i am assuming that is what it does.
I don't know what you mean by that. Could you take some pictures?One thing i saw which is slighlty concerning you know you get like a protective clear sticker / film over some of the circuitry on the pc board. I think this is to keep static dust off o those component, well quite alot of its has managed to get in under the sticker, like its stuck on the sticky side of the sticker. Could you buy new "film" i dont know what to even call it.
Also I'm pretty sure "static dust" is not a thing.