I used this stuff back in the day on ss, but b/c is a whole 'nother story. I've tried it recently (last summer) by rotary, Cyclo, PC, and hand. As with JDookie, it left a world of nasty marring.
Others claim they use it by hand/PC, but I *strongly* advise against it.
IMO it's one product we can live without.
If you want something really aggressive to use by hand/PC, get some 1Z Ultra/Extra or Hi-Temp Medium Cut.