Microscale makes an adhesive just for foil:
http://www.best1hobby.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=168&Product_Code=MY0008
(I don't know the vendor, it's just the first link I found.) It works pretty well, goes on like very dilute white glue, but sets very tacky; you apply a cover coat to the back of the foil (you can pick shiny or dull side for panel effects), set the foil in place, then rub it down with a soft-tip item like a q-tip, and it conforms reasonably well to surface detail. Bare metal foil is similar in approach and use, but comes as pre-adhesive foil sheets.
The trick is to work in small sections (or panels on the a/c), particularly on compound curves. If you've got a light touch with an Xacto knife you can trim the foil to match the panel lines once it's down. Foil gives and stretches a bit, so wrinkles can usually be burnished out fairly easily.
It's fun and pretty easy, particularly if you start small. (My first crack at it was a B-24, and even in 1/72 it seemed like it would go on forever, especially around all those engine cowlings.)
Good luck!
Greg