Hi,
I have no idea what is correct, but I would also choose a machine enamel and, looking at my own red tip, I would choose International Harvester Red as well. Especially as I have cans of machine paint in the barn already. Those paints are formulated to stay on better than anything else.
Oh, and I would choose Ford Blue for a blue tip!
Now, why isn't there a green tip? You know what I would use there.....
Stan
I used the model car paint (I can't remember the name but it's the little glass jars). Red with a little black mixed in (until it looked right) baked at 200*F for about 5 hours did the trick!
I tried testors paint and it was a complete failure the paint just will not properly dry even when put into a heating chamber, the paint does not dry hard when applied to metal. I am cleaning the testors off now and am going to apply what I consider a perfect match Krylon burgandy. I will post pics when I finish in a bit.