It is not a lubricant. I have seen people spray gun barrels with WD 40 and get rusted in no time. WD stands for water displacement, not metal part lubricant. When you have two metal parts rubbing together the worst thing you can do is spray something on them that will attract dirt. You want to spray it with something that will dry, but create a slick surface so friction will be reduced. That's why I suggested a can of graphite.