i need some help from u guys..my old man's car is the first batch of wira. everything is still satisfactorily good n love driving it except the rooftop rust which already made 3 lines of fugly bumps.

one mechanic (medium class workshop) suggest me to replace the roof top. cost a bit more than rm1000 (if not mistaken). he said, if i just remove the rust, it will keep coming back and it's a normal in early wira.

my question, does it affect the main car structure? how about the cost? any other suggestion?