thats going to have more the effect of polishing the edge rather than reshaping them. I would reccomend a relatively fine file or most preferably a pocket stone.
http://www.rei.com/product/670968/smiths-diamond-pocket-stone?preferredSku=6709680018&cm_mmc=cse_froogle-_-pla-_-product-_-6709680018&mr:trackingCode=6583071B-81F9-DE11-BAE3-0019B9C043EB&mr:referralID=NA&mr:adType=pla&{copy:s_kwcid}=&gclid=CLr64oGA7bMCFelDMgodBmYAZw