What's the deal with the rear arches? I understand they are prone to rust. Correct me if I am wrong. I have bubbly surface rust (feels solid) on the drivers rear arch. Is not a major issue right now (wiring and door lock first). However I took the car to my body shop guy who I have used many times and he couldn't quote until he had a look at what rust was there/how severe. He said the wheel arch had been done already so assume it's not so bad. He then said for me to source a wheel arch and he will do the work. Is it that drastic. I though it would be a sand down job and respray. Also arches they common to source (let me guess FB 😜)