AF Guy,
I normally don't apply primer before painting, but I do rub any imperfections out with steel wool (final rubdown using #0000), wash it thoroughly, dry it thoroughly, just before spraying I rub it over with a tack cloth. After 24-48 hours, carefully spray a coat of Gloss Coat, and let set for 32 hours (rub any imperfections with #0000 steel wool).
Apply whatever decals (wait 12 hours), then cover once again with Gloss Coat.
This technique gives a beautiful finish, makes the decals look like their PART of the finish, and can be polished later with furniture polish for a "metal" look.
*CAUTION*: Gloss Coat will "melt" silver paint, so avoid using silver on area's to be finished.
There's all kinds of techniques in obtaining a beautiful finish, this is the one I use.
Frank