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I can say from my experience, brand new walnut media treated with frankford arsenal brass polish doesnt shine as well as cruddy old corncob....
As far as the spray.... the only real difference between a product in a spray bottle and one in a pour bottle is you get a lot less bang for the buck in the spray bottle, because it has to be thinned down quite a bit to be able to be sprayed.....
Do make sure there is no ammonia in whatever you choose, or it will weaken the brass...
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