Does anyone know where I can get a small jar of touch up paint for a steel frame? Can't seem to find anything online, and everything auto oriented seems to be based only on a paint code for a specific make/model.

Car touch up paint will work. The problem is finding the right color. If you have an auto paint supplier in your area, they have books full of different colors. The one by me will even make up custom rattle can colors.

I like Testors (or similar) model paints. Many colors, and easy to brush on (using an actual brush).

Testors and Krylon, among others, make paint pens that work well for touch-up provided you have a pretty basic color.

Testor, auto touch up paint pens, spray cans and even finger nail polish.

+1

I just went through this last week, and didn't find a satisfactory solution until I went to the local auto paint supply store. I brought in my bike, and we compared it to their paint chips in their books. Each paint chip had a hole in the middle, so we could find a perfect match. My particular shop can sell either rattle cans or small bottles with brushes. I opted for the bottle brush, which cost me less than $10.