My first thought is that it would take a hell of a lot of time and effort. The reason is that there are no large surfaces on a moped that you can hit with a sprayer with any kind of efficiency. For instance, on a car you can do a whole quarter panel at roughly the same angle, nearly 30% of the job. On a moped i think you'd have to do a lot of masking which would give you a lot of overlap if you're not super careful, (not to mention huge amounts of intricate sanding). I'm all for it, though, despite my negative post, and you'd be the first person i know of who did it! And for damn sure you'd know every last molecule of your moped. Good luck.