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Tumble finishing, also known as tumbling or rumbling, rotary finishing, barreling, or barrel finishing, is a technique for smoothing and polishing a rough surface on relatively small metal shapes and jewellery.
The easiest way to finish your metal clay (which requires minimal elbow grease), is to use a tumbler with mixed shape steel shot, water and a burnishing liquid or powder. Just brush your pieces quickly after firing, pop them in, and tumble for anything between 30 minutes to 6 hours, depending on your tumbler. Check your pieces every 30 minutes or so to see if you have reached the shine you are after. Done. Couldn't be easier!