If you want to make your spaceships have that metal look Sharpie makes these great markers you can pick up just about anywhere.

They have Copper, Silver and Gold.

This has the 4 pack I picked up at Office Max.  Comes with 2 extra silver pens.  You’ll use a lot of silver!

Try to work inside the lines.  These pens are just like paint. They will cover the outlines of the ships.

Check it out you can put the metal color on top of other metal colors!

My final product.