Of course, you can always use a paint brush with a paint that flows out nicely...

Amen to that! Let me tell you, those were the good old days, fresh repaint of wheels and running boards, did it about once a year and it sure did make the truck sparkle! Still do it with running boards because they're so beat up and I can't bear to part with them because they came with the truck.
Not to mention new body panels, and running boards I'm sure, don't have a good reputation for fit and quality. Sometimes our half worn out parts are better than new Chinesum ones.