Never realized they were cad plated. I did my booster the same way with basecoat, then sprayed a pearl overtop of that that gives it kind of a greenish flip to the color, with a matte clear, my bosses 442 he had the cad plate spray paint stuff from eastwood, I actually think mine looks a little better, and has stood up better than his. Its not quite right, but like you said, keep the $ in your pocket. Noone really notices anyway. Unless your going for a total stock appearance for shows or something it isnt worth it to me. Id pocket the money and paint your shields too.
Tony