OK I've read the previous posts, but would still like to pose the question. I've just got my hands on a previously abused by wonderous Brompton Folding bike. It was harshly spraypainted black by some fool. I'm sanded it down so I can see the original blue. I don't have much money, a good garage, or access to many types of paint - just whatever I find at the HEMA (typical big department store). Some say use spray paint... but I don't want to spraypaint and watch it slowly peel off. And I carry the frame alot, I dont want my hands turning blue.
You can use spray paint, it's not recomended. It globs and coats very ununiformly. You should be able to find clear coat at the local store, it's with the spray paints in the automotive section usually. Auto parts stores some times carry it also.