use white primer
When I painted the site ears on my AK, I first used brush-on white primer. Putting a bright color on top of black causes the color to look darker, but if you put down a base coat of white primer first, the orange will appear brighter when you paint it on. I used Citadel brand wargaming lead miniatures white primer, followed by a coat of Testors model paint in bright yellow. The yellow really jumps out now.
Originally Posted by p17Enfield
Hope this helps,
Field Testing Engineer
ACME - Weapons Division
"ACME, the Name You Can Trust!"