Makes sense, the acetone offgasses quickly, and cools the part it is on. The surrounding metals shrink, thus letting the relatively thin oil in.
I have used it for a few years , and can tell ya it works well, even though the arnmhair theorists are the only one's to prove it LOL
There are only two ways that evporating acetone (or any other liquid) will cool the metal. One is if the acetone is compressed and evaporates when uncompressed, much like coolant in an air conditioning system. The other way is if the metal is heated above ambiant temperature. In this case the evaporation of the acetone isn't really what is cooling the metal, rather the acetone is absorbing the heat, much like quinching hot metal in a bucket of water. Some of the acetone may evaporate during this process if it is heated enough.
You may be thinking about how evaporating perspiration cools your body. It does indeed cool your body IF the ambient temperature is below your body temperature.
The reason this stuff works is that the acetone lowers the surface tension of the atf allowing it to work it's way into very tight spaces. The acetone then evporates and leaves the lubricating properties of the atf in place.
Edited by whst400, December 09, 2012 - 10:30 PM.