Scratched stanchion

I had an argument with a bit of granite earlier today and have scratched the stanchion on my pikes. It's not that bad but I suspect bad enough 
Any suggestions re a DIY repair would a gentle rub down with some wet and dry help? is this likely to cause more problems?
Someone suggested a rub down with a very fine wet and dry, a coat of black nail varnish and then another gentle rub down. Anyone have any thoughts on this?
Cheers

Any suggestions re a DIY repair would a gentle rub down with some wet and dry help? is this likely to cause more problems?
Someone suggested a rub down with a very fine wet and dry, a coat of black nail varnish and then another gentle rub down. Anyone have any thoughts on this?
Cheers
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Have read.
Parktools :?:SheldonBrown
http://regensuspension.co.uk/stanchion-wear/