Hello everyone. I've discovered some new rust on my 400E and was hoping to get some advice on how to tackle the problem. The car has been my dad's winter car for the last 5 years or so and I recently took it. About 2 weeks ago, I noticed a little rust on the rear driver side fender. Over the last couple of days, it's gotten larger and there is a bubble that has formed in the area.

The car has some rust on the trunk, so I figured the patch on the fender would be about the same size. I'm alarmed at the progress of the rust though. The rust on the trunk took about 18 months to get to its present stage (hasn't spread in a long time) However, the rust on the fender has grown much faster.

I plan on keeping the car for several more years and would like some suggestions on what to do with the fender. I'm attaching some pictures and would like to know the best way to fix this rust problem. Should I get the panel replaced or can this be sandblasted?

Thanks!

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