If the paint is not completely off, maybe you can repair it yourself with scratch-romover ($10-30). If the iron is seen, you'd better go to the dealer, ~$300.
I have a scratch remover, which cost $10. It works very well on a blue car, but does not work at all on a red car. There are many different brands on the market.
请问行家, 车身漆被划了一道, 不知补一下漆要多少钱?