Rust is indeed not the problem over here, so I think I have to sand it, put a lot of putty on the hood and do my best to make it flat again, then put some (black) wrapping on it.
Same story for the roof, let it spray is an option I consider later because it's expensive if you want to do it good.
On the other hand, I bought the car really cheap (800 Euro) because of the hail damage, so a little invest to make it good is to consider, the car is like new on the inside etc.