I used exterior latex paint on aluminum siding over 20 years ago and it never peeled. The trick is to get it real clean. The peeling is caused by dirt preventing the paint from making good contact with the surface.
Unless the surface is real shiny (which I doubt), you don't need any primer. I used a car washing brush on a pole to clean the surface, mild soapy water and used the hose to rinse it. Let it dry over night and began painting the next day - 2 coats and it still looks good 20 years later.
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Last edited by ToolGuy; 01-30-2008 at 06:57 PM.