i was thinking automotive clear coat? is that a good idea or no?
Yes and No: It certainly isn't a bad idea just costly unless you know someone at a Body shop to shoot the bars for you and really the way scooters get banged up the clear coat isn't going to last very long.
Anything off the shelf called " automotive clear coat" really isn't the same thing.
As Rob mentioned just grab some Rusto clear coat or any brand off the shelf and rattle can the bars. Let each coat dry completely before applying the next coat- Follow the directions on the can.
when they get banged up just sand them with a 220 grit and rattle can them again.