Thanks for the compliment!
Here are the specs for the paint I used on the C-57D:
Rust-Oleum "Painter's Touch" series, available at Home Depot:
For the primer: White Wet or Dry Sandable Primer, # 1981830.
For the finish coats: Metallic Aluminum, # 240554.
Use your favorite modeling putty to fill the seams between the saucer sections and the three extra ramps that are to be built closed, as they did not exist on the original movie model. The kit was made that way so all bottom saucer sections would be the same, hence avoiding extra expensive tooling.
You'll find you will need to apply many coats of primer, sanding between each coat and reputtying where needed. I used the brute force approach, sanding with a Black and Decker "Mouse" as this is a BIG job. (The faint swirly patterns you see on the saucer sections is supposed to disappear, too. That is merely an artifact of the molding process, caused where the liquid plastic was pumped into the mold.)
Then when you are satisfied that all the seams have disappeared, start applying the aluminum paint, again as many coats as you think is needed, with fine wet hand sanding between each. I used 400 grit wet paper.
After I was satisfied with the final coat of aluminum, I sealed it with a generous application of Future floor polish to give it a nice gloss.
Good luck! Let us know how it comes out. See ya in about 6 months or so! 