little rust question

so i was washing my car today and i noticed a little paint chip on my roof. it is tiny, like 2mm across. well it has some rust where the paint is missing. how should i take that off before i put a dap of touch-up paint on there.
thanks,
steve
 
wytstang said:
I would it may not spread wide but it can go deep. Get some really fine sandpaper 1000+grit and lightly sand the area. then touch up.
If he does that he will need to buff after the fact. Just thought Id throw that in there.