I finally found the right kind of paint for the surface pattern. At least I hope I did.
This is an alkyd paint called Miranol. Should be weather and heat resistant up to 120 Celsius (250 Fahrenheit). Lighter colors will turn slightly yellow with temperatures over that. Since I'm using black that probably won't be a problem.
Used a small foam paint roller to apply it.
Here's a sample of what the final color will look like.
Did the damper top first in case it would suck.