That color can be done in two ways...
1st way to do the color is to go to a car paint jobber that has a computer color scan machine thing (color spectrum analyser), the guy will scan the color and then the machine will match and mix all the tints you need for it, no idea if can be done in a full base color (if the red is a candy) but i have seen similar color so it might be possible (i think)
2nd way, as you said, use a grey, silver base color and shoot the candy (this is how is called) color over the top, the painter has to experiment to know exactly how many coats he has to put over it. Doubt is more than 3.
I would try to find a shop with a color spectrum analyser 1st. If you have one you are almost set.