I flew my -7A for nine years without any paint on the aluminum with no special care other than an occasional wash to remove bugs and bird droppings. I primed and painted the fiberglass pieces a couple of times with epoxy boat paint.
When I finally got the plane painted 4 years ago, the painter did his standard prep to apply Acry-Glo. Since then, there haven't been any issues of corrosion or paint not adhering that I've found.
In short, based on my experience, with your scheduled painting within the next 6 months, I wouldn't bother doing anything.
Mike