Originally Posted by
Jmpierce
I just saw another thread that, I don't remember what to call them, pens were used. I used these in a past life as a graphic artist. I only used ink but a video show them being used with paint. I have a bunch of Testers enamel paints I'm going to try.

I was able to find mine. They need cleaning but I think they'll work.
https://youtu.be/1Oo9WwzsR7g
Ruling Pen or Pin-stripping Brush?
J.P.,
Those are ruling pens, I have used them and while they are good I have found if not careful small scratches can occur and it is difficult to turn a corner (maybe I need more practice/patience.). What is nice about them is for box lining they leave a sharp not a round end on the line that you are making.
For box linning, I have used thin cardboard as a guide....Put a layer of blue tape 1/8 of an inch away from the line you want to make and then overlay/lap the thin board as the guide. Much like we find on templates where there is a little space left so that the ink/paint will not flow under the template.
I have also had great success with Koh-I-Noor Rapiographs, which you may have in your arsenal. 4 or larger....thin the paint so that it flows easily. These are much easier to control than the others mentioned that have been mentioned because they are like a pencil or pen.
But for my cars, nothing beats a
striping brush!
Best, Ben
Rapidograph's
Super old school....harder to control....but it can make letters!
Nothing beats One Shot Enamel...if using Testors, be sure to thin it well, otherwise, it will not flow properly.