RE: Krylon paint
I've had better luck with Rustoleum. Every color I've used has been fuel proof (I use 15%). Rustoleum's clear coat (I believe it's called Crystal Clear) is better than Krylon's clear coat because it doesn't turn yellow. At least, it hasn't turned on me in 2+ years.
Just my opinon though.
Nonetheless, whatever you try, test it on something other than your Champ.
Mike