shertex,
I'd just ride with the car and have the shop do the light restoring/painting of the areas.

When your jack points start to rust-out, that would be the time I'd ditch the car b/c of rust.

Have you reamed-out your moonroof's (4) weep hole drain lines on that car yet?

I've described the procedure to my Brother that owns my old '99 W210.

vstech recommends a 3/16" width by a several foot length of weed whacker line to do the <reaming> job.

FWIW, my CDI w/o a moonroof, has screw holes under little trap dors on the (4) corners of it's roof, for the attachment of a luggage rack - so, I too need to learn the procedure to ream-out my weep hole drain lines on my moonroofless sedan too.