I painted a two inch wide, red stripe on our Avion about 20 years ago with some left over paint after painting
our pickup. To set it off I bought some black vinyl stripping from a boating supply. Once the vinyl was in place I masked on top of the vinyl then painted between. I used an air brush which worked very well and made a nice smooth coating, however it took more than several coats to get the required build-up.
It looked real sharp for a number of years, since the truck was silver with a red top and red band down the center of the fenders, doors and box.
Unfortunately, time has faded both and they certainly need redoing.
I used Ditzler Delstar at the time. That was before clear coating was done much, especially for amateur work. With the new formulations of auto paint, these days, I believe the results would be much longer lasting.