Paint protection, preventing algae, mildew and stuff

It gets parked next to the alley behind my shop and every morning it has dew all over some if not all of it. I don't think I can put a roof over it, not that that would prevent the dew but from what I see of houses around here, the paint eventually gets algae or black mildew on it. This sits on the north side of my shop so it stays cooler and damper there.
I have this idea of putting some kind of a zinc strip around the edges near the roof line since zinc is a good preventer of algae and mildew, but I'm not sure it will be easy to attach. I was wondering if a line of zinc paint would work? Any thoughts?
I have seen some zinc primers with a high zinc content and thought maybe the dew dripping down from a line of zinc primer would work. Zinc tape would be nice but I doubt there is such a thing.
Credit goes to my bride for the cool design.