plain white toothpaste works pretty well in a pinch, also provides PC with a nice clean minty smell.. lol.. but Id not recommend this at all , just know from experience it does workYes of course not to be tried, I was making a point. But even dressing would provide better heat conductivity compared to nothing/air at least for a very short while.
There was this website back when that tried this actually. I'll post the link if I find it.
Edit: Here is the link.