I’m not sure where you started reading in this thread but I never really endorse nor am I trying to persuade anyone to use WD40. My whole reason for posting was because someone said “DO NOT USE WD-40! It is proven to evaporate and attract moister!” I don’t know what is in WD40, you don’t know what’s in WD40 but I do know it does not attract moisture it displaces moisture.

The main reason for rust inside an RC engine is, the methanol in the fuel does attract moisture. If you flush the methanol out you are better off.

As to whether or not WD40 has kerosene in it you need to take it up with WD40. This is from their site.

“What does WD-40 contain?
While the ingredients in WD-40 are secret, we can tell you what WD-40 does NOT contain. WD-40 does not contain silicone, kerosene, water, wax, graphite, chlorofluorocarbons (CFCs), or any known cancer-causing agents.”

It would be unconscionable for such a large company to make such a proclamation if it were not true.

http://www.wd40.com/AboutUs/our_history.html