I've become a big fan of doing the foil under the primer/paint. You can get very nice, bright and shiny emblems using this technique. a pencil eraser will work well to clean off the foil and is a little less likely to sand through the foil.
I had over 200 Hot Wheels and Matchboxes at one point and always loved cars. I think I was about 6-7 when I got my first kit, either the Snap-Tite '55 Chevy or the Snap-Together Police Van. I don't have the HW or Matchboxes anymore, but I kept the love of models.