Bought a Benjamin Marauder, and it looked virtually flawless. A few days later, after storing it on a foam mat in an area that I assumed to be completely devoid of moisture, I noticed a lot of little speckles of rust all over the air tank. I am not worried about this affecting the functionality, so much as I just dislike the idea of having a rusty airgun, if avoidable. I wiped most of the rust away before taking the photo, so there is very little visible. Anyone know what kind of oil or stuff I should rub on the tank to prevent this in the future? I don't want anything that will corrode it or seep in through the pressure gauge threads.