Dying convertible top ?

You can dye it with SEM dye just like vynil and plastic. You'll need a whole lot of it. Thats a heck of a lot of area to cover. Weather and folding takes its toll though so repeating and touch up will be needed.
Ever seen a black top with only the piping dyed red ? That was a chore sure enough. It didn't look so bad either. Different anyway. Good luck