Personally Id be a little wary of the really light oils like that.
The lighter the oil the more easily dispursed it is...just a swipe on the lining of the inside of the safe & if you have no humidity protection & dont touch the gun for months you could find rust spots...this has been my experience anyway.
I actually use my nail gun oil for wiping down & anointing the bore...its designed to penetrate the guts of pneumatic nail guns, so its thin enough, but its a thicker consistency than the usual household oil such as the hair clipper oil....its also thick enough that it doesnt seem to run back down the bore into the action area so actually works a treat & a bucket load cheaper than a firearm related brand name oil...!
The man who knows everything, doesnt really know everything...he's just stopped learning...