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For more on marking an answer as the "Best Answer", please visit our FAQ.Alloy wheels are usually coated with a clear type lacquer to keep them shiny and this can flake and bubble after some time. Simple test take a magnet (fridge door thingy?) and see if it attaches to the wheels, if no then they are alloys.
One point, you should NOT sandblast alloy wheels as the blasting creates microstresses in the alloy which weaken the wheels and can lead to early cracking of stressed points.
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