etching
any lose or huge surface rust take off. you can do somehing as simple as take sand in your hand and run it across the barrell a few times. take a towel with some ammonia across it and then etch it. are you going to have some pitting it yes you will. it still will look better than what you have and you will not lose pattern at this point. you start having concernes about losing pattern when you take off layers
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