Thanks guys.
Joe, the weathering may look complicated, but it really is a straight forward process, though it takes patience. If you want to introduce chipping, showing both the aluminum and primer coat, then here is what you do. spray a coat of desired metal color, I used Mr. Paint Super Silver. Seal this metal with a flat varnish, this helps with the chipping technique. Decant TreSemme hairspray into a container, load it into your airbrush, and apply a coat over the metalized areas. I used the hairspray chipping technique and there are infinite videos on YouTube about that. Spray on the primer color, in this case I used straight Tamiya XF-4 yellow green. You only have to do this in the areas you know you're gonna chip, you don't have to bomb the whole kit. Using a wet, stiff brush, begin chipping the areas desired. This may take a little elbow grease to get going, but it works beautifully. For stubborn areas, gently use a toothpick to get it going. When I'm satisfied with this step, I then seal it again with a flat coat and apply another layer of hairspray over that. Next, I apply the color scheme to the model. It will look factory fresh at this point. I then mix lighter and lighter shades, fading sun worn surfaces, introducting tonal variations, adding wear to the areas that are walked on and so forth. Once I'm happy with this (BTW, I painted this thing 3 times before I was satisfied, it prolly needs metal landing gear, it may be about to collapse from the extra wieght), I begin the chipping process again. Look at references to get a feel of where to chip and fade. When this is satisfactory, I spray on a gloss coat, apply a dark grey sludge wash, wipe it off after about 15-20 minutes, and let it dry over night. I then apply a flat coat and begin using charcoals and pigments to add streaking, grime, wear, and fading according to the reference pics and my eyeball. Thats it.