Canopy tint tutorial

The smoke works as a general tint, but there's a lot left to be desired for some of the modern canopies with the metallic iridescent highlight.  As for helos  yes, clear green works good, but I recommend alclad armor green as it looks much more convincing.  

I use Tamiya Smoke (great on modern fighter jets) and Transparent green or blue (for helicopters) for various canopies. Spray in 2-3 light coats until you're satisfied with the right shade. Sometimes only 1 coat would suffice.