A lot of MPC-era steam locos had "whitewalls," or a thin stripe of white paint along the flat outside surface of their driving wheels near the rim. Most American Flyer locos had a similar visual effect. Although it might not be prototypical, what's the best way to apply this kind of stripe to a postwar Lionel steam chassis? A thin brush? Paint pen? White out?? Should I mask the recessed center and paint the whole wheel? If so, how can I avoid getting paint on the running surfaces of the wheels, or the gears? Thanks in advance for sharing your advice! -Ted