"El-Lobo II" is a Natural Metal Finsih" (NFM in modeler-speak)...
B-17s have aluminum skins with fabric-covered rudder, ailerons, and elevators... So you're starting with "Aluminum" as the shade of color needed..
NMFs are some of the most beautiful finishes to look at, and they're also the most difficult to achieve... There's a whole slew of things you need to do to do it right...
This thread will take you the one with the most information of any on the frum..
/forums/t/127602.aspx?PageIndex=1
Just about every type of NMF is discussed...
As for spray-painting..
That's what I do.. Krylon's "Premium Silver Foil Metallic" in a rattle-can is about the best "silver" paint out there for NMFs I've ever seen.. With proper surface prep and application, the stuff reflects almost good enough to shave in.. It's expensive as Krylon goes, about 8=9 bucks for an 8-oz can, but wirth it, IMHO...
Once it's cured (about 48 hours), you can handle it bare-handed and doen't require buffing, sealing, or anything else...