[Kal-EL]

Youre gonna skin the outer area of the cpu socket, front and back of the board. If you use grease in the socket, remember what spfoam said, not too much if its vicous because you dont' wanna bend the pins when clamping down the cpu fastener. You should only need to grease the socket and not the rest of the board since you have the skin to spread around the socket.

If you have closed cell foam, i'd cut out the square of the cpu h/s in a layer of paper towel and then cut out the shape of your waterblock base and lay that over the paper towel.