Use Barrelbrite compound in your tumbler to clean and pre-polish your silver and base metals. It also helps keep your stainless steel and carbon steel shot rust free and in good shape.
Less than a teaspoon is enough for the 3lb barrel, for a smaller barrel you only need half a teaspoon (10g per 1kg of shot). If you use too much compound it will fill your barrel with bubbles, which will slow down the tumbling action. If you use too much compound in a plastic barrel the suds can even start push against the lid, causing it to leak. Try it with less than you think and see what happens.
Sometimes called burnishing soap or tumbling soap.
Includes 250g of compound.