Remove by lightly sanding. Clean with a solvent such as trichloroethylene. Re-spray. You may sand into the carbon a little, it will be ok and it will look great after the gloss.
If it's anything like carbon helmets you shouldn't sand through the gel coat to the carbon weave as it may well weaken it. As said lightly sand and don't go too mad.
I've not tried it yet, but certainly looks impressive, and friendly to use, no sanding...nothing carcinogenic, flammable, toxic or harmful either, apparently. Just a bit of skin and mucous membrane inflammation .
I did see that, my only concern is that this is a tight budget and at $40 for 500mls..I can do it much cheaper with some patience and fine sandpaper and probably in a quicker time.
It's always good to know that products like that are around though
I did one with a 20 pack of fresh stanley knife blades once. It was dead easy and looked mint when finished. I do have the steady hand of a gunslinger though.