Mazda 6 rusts EC 11/2002

Hello Mazda 6 driver, who has problems with rust at Mazda 6 year of construction 2002?? Mine starts to form at the rear doors of bubbles (on the inner fold of the door) after 2 1/2 years!! In addition, two small bubbles are available at the front edge of the bonnet. The vehicle is not galvanized even if the seller of the branch said otherwise. At the water drains of the doors there is also no wax or similar preservative to recognize or feel! t this problem, or is it an isolated one??