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if they are deep you can glue them down and then sand it ... i had to do that as i had a nasty nick in mine and it still came out like new again, with a war scar ;)

If you need to use glue use it...

Use good quality sandpaper... I used 800 grit. Then rub it good with your palms and put a THIN coat of strop conditioner or neatsfoot oil. I rubbed mine several times, about once an hour, for a day...