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The cleaner Bon Ami is also based on Feldspar (later formulations also contain Calcium Carbonate in the form of limestone). Some old time engine builders would throw a bit of Bon Ami into the air intake of a running engine to help bed in the rings.Jim
Ramon, the Timesaver folks have a website here in the US also and show the 4 grade sample kits at a reasonable price, but I notice that the grades range from 40 to 320 on the green (for steels and cast irons). You had indicated I think that 320 is about the coarsest needed for model work. So where are you finding the finer grades? Bill