Mother's "back to black" i think is also silicone based. At least it seems to be, tho i didn't read the bottle. Also makes the engine look perfect. I also used it on various other black. It's easy to find too.......most any auto parts store. I tried it because someone at RAT said he'd tried all of them and said trust me and get the BTB. I did and whether it IS better i dunno cuz i haven't used PS or S100. But it does work great. I'd probably go with the cheapest of the 3 if they were all available w/o driving any distance. The BTB is $5-6 a bottle which should last me a couple years judging by how little you need.
