A quick google using "aluminium car primer" throws up a number of recommended etching primer tho' which one (or other) that an Audi bodyshop would use I am not sure.... which was, of course your real questtion I guess?
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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