As far as the tires and wheels go..I have had good luck using this technique.

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Once the wheels have been painted and installed in the tires, apply the decals on a dried bed of clear to avoid silvering, then mask off the wheel and hit it with your favorite dullcoat or matte finish. I do this with the wheel in place so that the matte coat doesn't crack while installing the wheels.

I also do a little grime wash before final clear to tone down the brightness of the tire logo.

Hope it helps