I took advice from Joseph Stachler from TM of using a paint marker for quickly and relatively neatly painting small areas, from handrails to steps.
You'll notice the paint pen in my 1st photo. I tried that for painting the tires while the wheels are turning but it wasn't as effective. You have to push down on the pen to get the pint to come out. So pushing down, while holding it on the tire didn't work out very well. I couldn't get enough paint out with one push of the pen, it needed continuous pressure for an even flow of paint. Phil mentioned this same issue above over a year ago.
I went pack to the fine tip brush, as it was much quicker and easier for me. No pressure required on the rotating wheels, just touch the brush to the tire.
That was my experience also.
