odd rust spot

[redstack]

I'm looking at an 84 ROW Carrera, that has only one rust spot on it. I'm sorry I don't have a picture of it, but I'll try to describe it.
The drivers side fender, on the inside lip, where the trunk lid gap is. On that vertical surface facing the trunk lid, there is a 2" section of rust. My thought is that it was either a replacement fender that was poorly prepped, or some how the trunk lid was misaligned so that it was hitting there for a while.

Until the PPI is done I have no real idea about how it happened, neither does the current owner. Even the mechanic doing the PPI suggests that it's beyond his field of expertise. But I think he will know if it took a hit on that side that would cause a fender to be replaced.

My real question is how to repair it. My thought would be to mask it off above then remove the rust with one of those abrasive pens, por 15, topped with touch up paint. A light sand and buff.

My reasoning being that due to it's position, it wouldn't be visible but would definitely want to stop it from spreading.

Oh and I'm 3000 miles away from the car even though it's right next door to my home. So this is all based on memory.

Any thoughts oh wise and wonderful men who worship Weissach?

[TantricEuro]

Wait till you own the vehicle. Bring it to the Body Shop. Have them diagnose and repair. If you want to tackle the job, we would need pics and a good description. Pick yourself up a Body Work book. There are plenty to choose from. get studying.