Rust was unfortunately always one of the biggest problems of the Charade G10, especially the pre-facelift version MK-1, which was sold between 1979 and 1981. In this case, hollow wax was completely dispensed with. Models of the first version are always eaten away by rust. Especially on doors and sills in the rear area in front of the rear wheel arches at the bottom)
The sill in the rear area (1) rusts first, the reason for this is rainwater that penetrates through the tailgate of the hinges and thus runs underneath the C-pillar and cannot run off.
The main girders (2) usually look worse than it is, because they are 2 superimposed sheets, the outer sheet metal is 0.5mm thick and a 1.5mm sheet metal underneath, in 99% of all cases only the thin, outer sheet metal is finished and looks ugly.
The transition between sill and floor (3) is rusted through especially in vehicles that have stood for a long time in the open air and have not been moved, here an example for (3):
The front fenders actually have only one weak spot, the area where they are screwed to the sill (behind the front wheel). The reason for this is the soil that is thrown over the wheels to the "back" where it is usually not removed, thereby accumulating moisture which has permanent contact with the mudguard.
Of course, the area of the A-pillar must also be checked if rust can be seen on the outside of the mudguard, but the sheet metal at this point is very strong and only in the rarest of cases does it look like this:
The doors are most affected by rust, especially on the inside, the bottom of the door is the so-called drain strip. Unfortunately, too few drain holes were provided by the factory so that the water stops in the doors, which accelerates their rusting through.