Finger is a big nono if you apply thermal grease, but you can cover it with some plastic foil to avoid oil and skin issues...I've always used my finger
Originally posted by: FPSguy
I just use a toothpick to spread the compound and haven't worried too much about thickness, figuring that the pressure between the heatsink and chip would push any extra compound to the side. Is it really a problem to apply too much compound?