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I think Pat said 1200 grit (which is the finest). I would probably get a 800-1000 grit too and start with this, as this will do most of the work. Then use the 1200 too finish off and smooth off, before t-cutting / polishing etc.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo