Gyptal paint is what I think you are looking for. Brian on the old forum had a link and info on that maybe he can repost.
It is easy to mix up the small amount of the Testors' paints (if you have some) you need for the top of the starter solenoid. It is an odd red, need some red, white and maybe a bit of brown. Or you can buy some but you'll have a 10 lifetime supply.
Also, the top of the rivet shouldn't have much/any on it as that was added after the paint daub which it there to seal around the rivet.
Hope this helps,