Painting an aluminum jon boat?

I've acquired a 10' aluminum jon boat which is currently painted in camo color scheme. I'm wanting to convert this into a dinghy/tender for my moored sailboat, with a white hull and blue interior (Boston Whaler). What sort of paint and prep would you recommend? I was going to go to West Marine and ask, but thought I'd get some opinions before going. I'm guessing a medium-grit sanding to remove the old paint, followed by some sort of acid wash. I know the white bottom will inevitably be scratched--comes with the territory. I was also informed of a slow leak. I've never had the boat in the water to see this, so I thought I would put it on sawhorses right side up, fill it with a little water and see if I notice any drips on the undersides. Is there an epoxy anyone would recommend for fixing any small fissures I might find in the aluminum?