aerosol??
hmm, rough guide i used to use minimum of 3 cans per panel (used to do a brilliant job with cans) but as lightweights are flat -call it 2, obviously depends on what finish you are aiming at..show room shine 4- 5 cans per panel, green lane friendly paint job 2 per panel..
Once did a HONDA BENLY 185 fiat chrome yellow - to do the tank 2 side panels and front mudguard 15 cans, and that was gloss finish super shiney and I nevr cut it back or lacquered it.. ;)