Cars Q&A

I am facing rusting problem in my wagon r lxi 2003 model. rust can be seen on doors petrol tank cover stepeny compartment etc. recently my windglass broke while replacing glass rust was seen below the glass on which glass rests metal part.As such i have to replace the whole metal part also.I have faced rusting pb during warranty period in the engine compartment also. I have spoken to Maruti service centre,Anytime maruti and regional office regarding this poor quality issue but maruti simply washed his hands by saying it is out of warranty. I live in Jangpura south delhi water quality is good here how can I prevent further rusting? Is it because of improper sandblasting during manufacturing ?