Gotta believe that if you don't treat it with a detailing product at least occasionally you'll need to do this again eventually though. But since it sounds like application is about the same as 2-3 coats of B2B / Armor All / TS-1 maybe preventative maintenance isn't worth it.
I suppose. But how many years does it take to fade the new dye back to a gray color again? I guess we will find out. I can tell you that getting it muddy and pressure washing it had no effect on the color.
I never putting anything else on it again!! SN or nothing.