Its easier to see the different shades in this larger pic. The lighter colors are Aluminum, the darker ones are Duraluminum, and the darkest is Dark Aluminum. You can also mix the shades to get even more variety in the panels. You also don't need to seal Alcad. I sprayed a few panels with Dullcoat for more variety.
I don't know how thick Krylon is (I use Alcad's primers-both gray & black), but Alcad is very finely pigmented. Surface detail is not lost with Alcad.
Hope this helps.