This stuff
It's a candy paint, so the colour is transparent, which is why it lets the light through when you paint your lenses. You can paint solid stuff, like engine parts, interior trim etc with it if you use the Ground coat, which is like a metallic grey. Spray the ground coat, and then spray the colour over top and it gives you a nice deep candy.
I painted my radio bezel with it. Check out that deep shine.
This is the grey ground coat.
Finished