paint it, yes paint it..
If you collect your water for drinking etc, then the rust from the wind vein will leak into your water tank and if its a gal tank it will make it rust quicker too.
if your tank is poly then when you drink the water it will make you sick, too sick to go to your man cave...
so paint it...
Peter,
iPad with IOS 7.0.4 using Tapatalk HD
(Warning disclaimer:- the above may or may not be true, as I made it up so just paint it..)