I am about to put paste on my new 2600K and I have spent hours reading about application techniques. It really is very confusing because everyone has their own favorite method. I thought the video linked in #13 is very interesting and it does seem that spreading it with a card would cause air bubbles. But I have Tuniq TX-4 and that is the method they recommend. They even supply the card to spread with. It also seems from their application instruction pictures that they use a lot more than others use. I assume that is because the paste is thicker. TX-3 is even thicker than TX-4 and I like the way this guy applies it
I might try that since Tuniq recommends the card method. They recommend 2 lines of paste though but many have mentioned how difficult it is to spread.