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http://straightrazorpalace.com/srpwiki/index.php/Illustrated_Guide_to_Using_Micro_Abrasive_Film

Edit: I see you have read that thread,...

A relatively cheap stone that's gonna give you a good finish is a 12,000 grit Chinese stone available at woodcraft.com for $20 or $30 depending on the size you want

Chris just gave you some good...