Thanks, at first I tried Painting the tail fin white & then in black doing the "Tendrils" as they are called on bats, and it well...came out "Lumpy & Fat" it looked like Tits on a dog.

So then I painted the fin Black & Cut up & In with the white. This produced a much Sharper looking Tendril.
The bitch of it is that The Tendrils on the actual batcopter are all different sizes as well, making them a bitch to copy. I wonder why Gene did that?
Just for trivia: on the 1966 paint job the fin only had Two tendrils, not five.