Hello. My good old Audi 80Quattro type B3 year ’87 slowly gets old symptoms. At the door at the back left the rust blooms under the decorative strip. For me the question arises what is to be done. Unfortunately I am absolutely no hobbyist, therefore I do not know myself at all. I have already repaired relatively superficial rust spots, but I do not trust this case. I have the fear that if I remove the groin and start to scrape, then I will quickly How can I see if the rust is only superficial or if the door is already through??? Does anyone have any idea what such a repair can cost in a workshop? Can I even repair it myself? Questions about questions! If someone has an answer to this I would be very pleased. MfG Matthias P.S.:If someone wants to see a picture of the misery, then just write it here in the forum. – No, no, no, no, no, no, no, no, no.