I have some minor rust in the wheel well of my 98 E320. It looks like there might have been some damage from a rock strike or something a while back that and the previous owner didn't get repaired and rust formed. It's starting to spread to the outside of the car and become visible so I want to stop it before it gets any worse.

I have been reading up on rust inhibitors such as Rust Bullet and POR-15. My basic plan is to treat the surface and repaint with touch-up paint. The majority of the rust damage is inside the wheel well and pretty much invisible so I don't too much about the quality of the finish. But I want to be very careful with the two bubbles that are visible from the outside to get it as nice looking as I can. I know it won't be perfect, but as long as it's not very noticeable I can live with it.

Anybody been down this road before that might be able to offer some tips?

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Vienna, Virginia
1998 E320