The epoxy on the pins could be a major problem. If you get some on them try and remove it using rubbing alcohol and a very soft toothbrush or cotton swab. Be gentle around the pins!
On "How to Apply?" Follow the directions. I have used thermoepoxy that used an accelerator that you brushed on one surface and a spooge of the epoxy on the other. once the two meet they start the bonding cycle.
You can spread out the epoxy but be extra careful around the edges as you don't want to get it on the pins.
The amount of epoxy should be just enough to cover the GPU where when you press the heatsink on it will make full contact with the epoxy but will not be pressed out and come in contact with the pins.
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