I recently repainted my Hi-Rider tank and I masked all the way around the side of the neck after cleaning out the factory paint (which went all the way down). When the cap is closed, all you see is paint, but when it's open, nothing but clean steel. Paint where fuel can get to it is a recipe for clogging something up. Some like to paint in there to keep the finish from lifting around the neck, but where do you stop? I guess time will tell if I did it correctly or not.