He suggested that when I'm done shooting in a rain, or drizzle, to just use WD-40. Seems just a little odd. But, that's just me. So, what do you all have to say about this?
Stainless steel is more resistant to corrosion but it CAN still corrode. WD-40 is a water displacer (That's what the WD in the name stands for; it's NOT a lubricant even though when fresh from the can it has lubricating properties), so spraying it down with that will displace the water and prevent rust. I would strongly recommend wiping it down with oil or other preservative lubricant once you get home though. That WD-40 will turn into a gummy mess if you don't.