This is how I made this.
Look like this. (it's dirtier in person)
Roll over above photo to see the change.
I used black acrylic water based paint. It wont damage your
white or blue paint job.
This small bottle is enough for 2 R2's
Start with an extremely dry white paint job. No clear
coat on mine.
Paint on a good coat of black with a brush that can
get to the bottom of the grooves.
Immediately wipe off the paint with a damp rag. I
used an old sock.
Then right away wipe again with a dry rag. Also a
sock.
Last "polish" the white parts with a fine
dry cloth. I used an old T-shirt.
Use a Q-tip to wipe some of the paint out of the groves.
This gives it a more used look and less like it was put there on purpose.
Next, doing the Dome