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Seasoning a tumbler drum.

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I have one of the rubber tumbler drums and the stainless steel that comes out has a definite layer of rubber on them. They are almost a gun metal colour. It is an interesting look but not the one I want. How can I season the drum or is there another drum to buy so that does not happen?

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I've only ever had this happen once, when I was tumbling some stainless with very small stainless pins. It has never happened again, even with the same combination. At the time I checked the sludge with a magnet and found that it was mildly magnetic, indicating that it had at least an element of the stainless in it. Unclear if it's the same with you.

As to removing the "gunmetal" look I tumble in corn cob media afterward, to clean the surface of the rings.

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