Sand and prime, shadow coat, sand and prime, repeat as needed till you have filled in the divots. The shadow coat, is nothing more than a light application of rattle can black over your primer. When you sand any low spots will remain black, keep repeating till no more black is left.
Not sure about that type of finish with rattle cans. You'll need to find a base coat to give you your color, mid coat of clear/flake, as that's a heavy flake unlike candy colors. Then follow up with lots of coats of clear.
Where your problem may be is in finding that large of flakes in a rattle can. Honestly that's more of something done with a spray gun.
Also your technique will affect it, in this case heavy wet coats of the flake, this allows the flake to lay flat as it's carrier flashes off. Too dry a coat and the flake will stand up and completely change the effect/color.
And one last side note, I helped with a paint job like this on a Mustang, we destroyed 3 paint guns shooting this large of flake through them. The flake actually erroided the needle and caps on them.
