How to weight paint complicated meshes? I'm trying to make wings. I want to animate them later so I have to rig and weight paint it.

Does anyone know if there is a simple way to weight paint the space between the layers of feathers? Or ho to make it simpler in another way
I found a solution. I read that you have to turn of Front faces only and activate 2d falloff.
Then all of the sides of the mech will be painted.