Lubriplate 130-AA has excellent water resistance. PYI doesn't even require annual re-lubes on the MaxProp, it's every other year with 130-AA. In my experience, even that's conservative.
stream: Point well taken but here in Maine I re-grease every fall. The new grease pushes out old grease AND water. Even seawater will freeze when it gets cold enough - and water trapped inside a prop hub . . . you get the picture!