UNIPAK thread joint sealant as thermal paste.

I've had some CPU overheating problems after moving to new room... I reseated the heatsink by removing old thermal goo and replacing it with unipak thread sealant (the kind that you use together with flax to seal pipe joints) . So far it works no worse than any other thermal goo. I don't think it would dry out - it never did when I used it as thread sealant on hot water pipes.
Amusing study of thermal compounds:
thermal goo comparison

I also replaced northbridge heatsink goo with unipak. Northbridge heatsink was seated on thick layer of stiff thermal goo, the kind that is almost like glue. There was nothing wrong with it's temperature but I did accidentally slide northbridge heatsink a bit, cracking the old thermal goo. It seems that unipak performs a lot better than the old goo did - probably simply because it is runny enough and I only have a very thin layer of it between heatsink and chip (in general, with thermal goo, the thinner the better).