Quoted from desertT1:
The paint is pretty bad on the outside. It falls off if you look at it funny. I want to repaint it, probably the whole exterior. How can I outline items like the lance so that when I sand the old paint down/off I can have a starting point instead of starting from scratch? Do I spot sand and do the whole lance and then paint it, then sand the blue and repaint it, and then the white with touchups where needed as I go?
The cabinet was originally painted using stencils. (This remained the case for most pinball machines up until the mid-1980s.) It appears to have a white base coat. They would have first sprayed the whole cabinet white, then overlaid the "gold" stencil and painted that, then overlaid the "blue" stencil and painted that. If you are going to repaint it, the usual method is to do the same thing - use some vinyl or acrylic with an X-Acto knife to make stencils. I haven't done this myself but I know many others have done so with good results.