Hi i have a 2007 impreza and over the last week ive notice some rust coming over the back window, only surface rust rest of the car looks ok well so i thought till 2 days ago when i notice a small patch on o/s rear arch having a bubble and a crack, the crack not noticable when door shut. Was wondering if these are a common problem

 

Hi mate, it's problably had some paint in the past

 

as above a bit too new to have rust yet! unless this has lived on the beach for the past 5 years