I'm detailing an X-EL 59 Chrysler and just polishing the body rather than painting it. So I can't use the "foil-before-paint" method on the fine New Yorker script, as I normally would. At 63 I can no longer see well enough or keep my hand steady enough to dry-brush the script nicely in silver, let alone foil it. So I came up with this idea:
Essentially, I mask the script with BMF. I apply a piece of foil to the script and burnish down well, as I normally would. Then, using a 4000 grit polishing cloth, I carefully sand until only the raised lettering is exposed - ie, the plastic shows through the foil. This might take a little while but resist the temptation to use a rougher grit. I then dry-brush the script silver, not worrying too much about accuracy. When the paint is dry I remove the foil. Tiny pieces, eg inside the letter "o", must be carefully removed with a sharpened toothpick.
You need to apply a big enough piece of foil to protect the surrounding area - polishing BMF makes a black mess than can be difficult to remove..
You need to burnish down carefully into all crevices or the paint will leak through. Dry-brush, don't apply more paint than necessary.
Try it on an old body first, as I did, but it worked first time.