Hi Don, I've done quite a few tint bands on various models and usually use normal Humbrol metalic green paint. The trick is to let the paint pot stand for a few days after buying it so the metal part sinks leaving just the green oil on top. Open the tin carefully without shaking or stirring and away you go. Practice on a piece of clear acrylic first and dont try to much at first. build up layers as you need. It's even possible to do a completely green screen with a heavier tint at the top.
Hope this helps...............Dick
Hope this helps...............Dick