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NuFinish is a polymer type of car polish. The reason many people use it is to impove cleaning in less time and to keep the brass brand new looking for a fairly long time. Is it needed? No. Does it help? Yes. I also like to use it with corncob media. You do need to put it in the media and run the tumbler for several minutes to get it to mix well before adding brass. You probably could skip one or two batches of brass before adding more. You do need to let it mix before adding brass.
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