i read on the rat forum to try s100 and maxima sc1 silicone... since a local harley guy suggested s100 to me, i looked for the maxima but could only find it online. i could not find the back to black either. i must not have looked hard enough.
i ended up with some motul shine and go, 8 bucks a can. i haven't used it yet since i bought it...
did put a little on the rear fender and it shined up pretty good, then i did the go part like it said on the can.
beware you anti-froggy types though, it's made in france.
which reminds me of a line from a guy clark song called picasso's mandolin. "born in spain, died in france, he wasn't afraid of baggy pants."
motul shine and go maxima sc1 stuff cat