1st is to make sure you did not cut all the way through if you did bring it to a paint shop. If not I would not wet sand you just that area it will in the end show up. 1st got to the paint store and get some wax remover, then use a polishing compound on the whole rim so that you don't have 1 shinny spot, after the scratch is no longer visably wax the rim w/ a good carnuba wax.
Next time you pull the wheel off for a new tire, have the tire removed then take the rim to a local paint shop. See if they will clear that part of the rim for you next time they are doing someone else's car or something. Might be able to get it done for nothin' if your nice enough.
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