Rapid Polish 290 is the first cartridge case finish designed specifically to bring a brilliant shine (20 percent brighter than tumbling media alone) and a protective coating to reloaded ammunition. Simply add several capfuls to the media in your tumbler and run. Rapid Polish 290 has ag reat residual value and stays in your tumbling media. You will use less each time you clean your cases. Rapid Polish 290 contains no ammonia, so it will not weaken brass cases!