shoe polish on dyed suede? Don't like the sound of that! If i was to use anything to try to "seal" the dye on a suede leather I guess maybe Fiebings leather saddle-lac or a "harder" paste wax than shoe polish. Something with a higher melting point that has some carnuba wax content...maybe...it's all an experiment at this point!
Tip: wear black shorts for the first several rides to see what happens!