Oil available in a can that when sprayed creates a "fog" when sprayed.
It puts a thin layer of oil on everything and prevents rust. It is great for coating the cylinders walls and protecting them for long term storage. Prevents rust and keeps the rings from sticking. Really is great stuff.

Here is an example (not the one I use but a good example): http://www.amsoil.com/StoreFront/fog.aspx