Originally posted by: BoboKattsomeone had said... if you get water on the CPU... you're sunk. In other words when you are rubbing it against the sheet of sand paper, which will be mildly wet on the surface, is there any special way to hold the CPU or shield it or prevent any moisture at all from getting on the other surface. I am just worried that when working no matter how careful you are you might get some sort of debris or filings or anything on the exposed critical part that would be facing up.
Any suggestions? Or it really is not an issue as long as you are careful?
That statement is simply incorrect. There is a slot on one face of your quad that is rumored to go into the cores. You should take care to keep moisture out of it. The way I do it is to moisten the sandpaper using a spray bottle, blot of excess water (no drops should be present) and lap. Have a moistened (not damp or wet) paper towel ready to clean off the CPU when you are finished with the lap. You'll see some copper paste (fine particles of metal suspended in the water) come off. Wipe down the surface gently and repeat the lapping.
The key is to take your time and to pay attention to what you're doing; that's the best advice to avoid getting water in that slot. I suppose you can tape it off too, but that's a bit extreme IMO.