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Originally Posted by nffc
It's an abrasive and it's *supposed* to smooth / polish the cracks, well that's the theory anyway...
The disk's f***ed anyway, so there's not an awful lot to lose. You can send it off for repair though, there are services around where you mail the disc and they sand it down and rebuff it.
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viisions of 60 grit aluminium oxide paper and brasso spring to mind
