You would have had to do a bit more with the eraser when using ln2 and dice, since they cause not only the eraser to build up on condensation but also part of the board itself. You would need to insulate the memory contacts top and bottom. And either foam or some type of towel with shop towel underneath. Sitting in a case is pretty much asking for disaster. Unless you prep almost the whole bottom of the board. (LN2/Dice) (I know because I tried it and it failed. LOL. Lucky i did not run power to my board. SS was fine, but the water chiller was more of the condensation problem. And LN2 caused the bottom of the case to get condesation)
Scarlet-tech. PJ is technically the best all around solution, but it is pretty messy if you try to do your whole board with it. As for it being in the socket? As Hallowen suggested, put it in the socket to protect your cpu. For me that is a mandatory thing. It has saved me more than not. If you use eraser, then you will need a thin layer of shop towel covering the eraser. Just like you would do the same thing using LN2.
If you use just the pj and you have your board sitting sideways...the condensation will just running across the PJ and right on to other unprotected areas of the board. So keep and eye on that.
These are only suggestions and not a what you have to do scenario.