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using a random orbital type polisher would be best in your case dealing with a single stage metallic finish.
being the metallic's used in paints are none ferrous metals they should not oxidizes any more then they do now with a single stage metallic finish. they are always exposed to the atmosphere.
with metallic's in a single stage they will float to the top of the finish when they are sprayed/ painted so buffing it will remove some and lesson the amount of metallic's your seeing.
how ever a good cleaning glaze ( not a compounding) will reduce this happening.
this is off the top of my head so the codes maybe wrong
86 ,086 ,8610 ,330 , 335 and for the 914 L96E gemini blue met. are all base clear colors from the factory. porsche started clearing there metallic colors in the mid 60's if i remember right the 86 color line came on late 70 for the 71 model cars and ran to 1968 and you will see some of the early 69 cars with these codes.
so have you tested a small area to see if in fact your dealing with a single stage color?
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