The roof needs to be cut and replace, many have done that.If rust appears on body area where the parts are non removable, what can be done to it? And is rust problem related to paint job quality?
My front hood last time already got multiple rust until can see tiny holes where light can actually go through. Replaced the whole hood at the end. Your Wira is on what year? Carb or EFI?
Yup, like bro fazidk and ken yeang mentioned is the glue to hold the sheet to the frame (tulang). Either corrosive or what those are the points they are rusting from.
Mine 1st Gen 1993 Carb, bought from mechanic brother 2nd hand. The thing is most rust after 3 to 4 years. Mine rust started after 8 years....