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Not that I know of. There is a place still selling TiPaint for Titanium powerbooks, but it wouldn't match, and reports suggest the site is a scam.
 
Sorry to say but you are basically screwed.

You can't buff the scratch away either cause of the matte finishing.
 
there was a thread on this exact same thing on sunday, look back a few pages and see if you can find what answers were given there
 
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