When I repaired my Prindle 18 hulls, I found that it made the job a lot eaiser to take the boat apart and mount the hulls upside down on a couple 3' 2x4s. (photo below) After repairing the bottom with thickened epoxy, I sprayed a 2-part epoxy primer on the hulls. After sanding, I sprayed a topcoat of Imron paint. This has held up extremely well. The top decks of my hulls were in good shape and I didn't refinish them, other than cleaning and waxing. Mulit color adhesive backed striping is available and is eaiser than painting them on.
Good luck with your project,
Jack