I put one on mine using twist ties, I know, it's funky but it works for me.
Not familiar with your board but the HS usually ataches with two nylon hold-downs. Go on the back of the board and squeeze to release. Carefully remove the HS and see if it has the pink pad on it. I checked both my Epox's and they had the pink pad covering about 60% of the chip, not good for eficent heat transfer. I removed the pink stuff using OOPS and replaced it with with white compound applied the way it should be. I think the chip is concave so you might want to use just a tad extra compound in the middle.
PS Did you know Johnny Depp defected and moved to France?