Using Arctic Silver 5 on PCH chip
I had to remove all the heat sinks and thermal paste from my 2011 15" MBP, and found that the compound on the PCH forms a thick 1mm-ish layer between the chip and the flat heatsink.
When I went to apply new thermal compound, I was using Arctic Silver 5, and realized that the normal minimal application was not nearly enough to fill the gap!
I ended up bending the tabs up a little bit so the metal plate sat much closer to the chip. I have another MBP that I have to do the same thing to, or should I just use a different sort of paste instead?
Edit/Update: It's up and running now, thanks for the K5-pro tip - I really think it made things much simpler! And I will probably use one of the Arctic ceramic pastes next time as suggested. :) Thanks all!