So far no rust on the silicone treated shafts. Frankly the WD-40 shaft looks worse than the control.
Wow that is surprising. WD-40 is usually a pretty good rust stopper. The corrosion test in that link on the other page shows wd-40 doing a pretty good job at stopping rust.
The silicone spray I tested most recently is the CRC brand so maybe the solvents in it are why the metal rusted so fast in my last test with it.
Overdue to post my results:
First of all - The Amsoil MP and WD-40 probably had the least rust and about the same amount of bright orange, dusty looking surface rust, even though the WD-40 looked the worst. Both cleaned up pretty easy with a rag and some spray lube, no pitting.
The control looked pretty nasty, and had some very minor pitting started. I used some MP and WD to clean it with some green al oxide pads. Looked fine and was useable with some elbow grease.
Now here is were it gets weird. The two shafts I sprayed with Amsoil Silicone spray looked good - as in no rust - from the top view. But when I picked them up, they were a bit crusty on the very bottom where the shaft was touching the tray. Like a dark red crystalline substance had formed. It cleaned off with a rag, easily and no pitting. Not sure what to make of it some, maybe Si-Fe compound.
So my conclusion, use Amsoil MP for a light firearm oil when called for. Use Amsoil Silicone spray only on polymers when you need a plastic lube.
Most important - none of the products tested are adequate for long term storage rust prevention.