During my days in body & fender trade school in the '60s I was recommended by the teaching staff to attend GM training. During that training I discovered that not only is metallic affected by the variables mentioned above but the amount of thinner used can also change the color slightly. Unless you have the controls & methods used by the factory to paint parts separately and have them match the best way to shoot metallic is to shoot all of the parts at the same time with one mix of paint.
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
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