I’ll have to make/create some sort of enclosed cabinet for the planes to use the Silica Gel Packets, but good idea. I have tended to agree about dw40 and have always steered clear of it with my tools. I didn’t know if it was an old wives tail of if there was any truth to it, so I decided to look it up just now.. from their sight: http://wd40.com/faqs
“While the ingredients in WD-40® Multi-Use Product are secret, we can tell you what it does NOT contain. WD-40® Multi-Use Product does not contain silicone, kerosene, water, graphite, or chlorofluorocarbons "
They appear to have a new line of stuff http://www.wd40specialist.com/ one is a rust inhibitor
In either case, I would hate to have something on my tool that would mess up a finish, so I may have to do some experimentation. I can try it on one of my crap planes (versus a good plane) and see how it works. It does dry, so it seems like if I rub the plane against some wood without any cut after it has dried would be the worse case for transfer.

Mike