ZoomZoom: Actually I was going to use Tamiya acrylic white in lieu of a proper primer. That's what I do when I paint yellow recognition stripes on an airplane model. It covers very well, and makes painting yellow (I'm guessing any light color) a breeze.
Ken: thanks for the advice on the amount of paint, I haven't thought of how much I need. Luckily I have a hobby shop nearby, hopefully they'll have what I need if I need more of it . Too bad I haven't read your post yesterday, I just bought Testor's 'Italian Red' this morning. I guess I'll start with that, if it really looks off, I'll go hunting for the 'Guards Red'.