Although the location isnt relevant to you, see here for an example of a Newcastle based wheel repairer and how they fixed scratches on the machined wheels on a GTD. I also had this guy fix some scratches on my painted Golf R rims and he did an awesome job.
Rim repairer in Gosford, Newcastle area
So the machined wheels can be fixed quite well it seems. See if you can find a wheel repairer in Perth.
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