Paint it like you would a regular car, just DON'T break thru the gel coat.
Exposed fiberglass is like a chemical sponge.. hence the gel coat
do that, and you will need to make sure you use a urethane, or epoxy primer first to seal the area
And don't use any flex additive...
I've bitched about that garbage enough, that I wont re-hash it
"Bye" Bye" Riceboy
(Ex-wife fore sale... take over payments)