I primed the wingtip liighing locations a light grey. The reflectors will mount on top of primer. The light grey is to hide the white fiberglass at the edges.
Here are the LED position lights I am using. I still need to drill the mounting holes and cut a slot in the wingtip to accept the circuit board. The wiring for the strobes and position lights has already been run into the wingtip. Once these are mounted I can easily finish hooking them up.