There is no paint coating in the world that prevents the burning of bird droppings.
A FLON coating will slow down the burn-in process, giving you more time to remove the droppings. Rinse it off with plenty of lukewarm/hot water and wipe the surface dry with a soft MicroFiber cloth.
If the coating is damaged, do not try to repair it yourself. Your FLON-dealer can fix it for you.