2CV rear wheel arch rust treatment

The rust proofing – or rather lack thereof – that came from the Citroen factory is well known to 2CV owners and mine was no exception. One of the areas that this manifests is the rear wheel arches as they’re hard to get to with the wings on and they get whatever’s on the road effectively deposited over them by the rear wheels. When we changed the chassis I had a look at them and there was a suspiciously iron oxide tinge to some of the mud brown so I put this job on my list.

With the rear wings off the wheel arches are easy to work on. The first step was a thorough clean of the clart to see what was going on. Mostly the surface was OK and the paint, although not great quality, was still holding. There was still some underseal in evidence but not uniform as evidenced by the areas of surface rust.  The main areas were the bump stop mountings and the seat belt reinforcement panels (that had been replaced in 2004).

2CV off side wheel arch with rust

2CV near side wheel arch with rust

Treatment for this was a wire brush in a drill to take it back to good metal followed by rust remedy.  A top coat of blue hammerite finished it off, this turned out to be much lighter blue than I was anticipating but it’s in an area that doesn’t show, will be covered in underseal and when the rust returns I’ll be able to see if it’s in a new area or the same place which would indicate a deeper problem.

2CV off side wheel arch with rust treated

2CV near side wheel arch with rust treated

With the rust treated it was time for a decent coat of underseal, not very pleasant stuff to work with but when it’s been warmed up it at least goes on easy enough.

Undersealed 2CV off side wheel arch

Undersealed 2CV near side wheel arch

The final part was the leading edges where the wings are affixed.  There were a few places where the tin worm had established colonies so these were attacked with the wire brush followed by rust remedy.  After some creative masking they were treated to etch primer, primer and two top coats.

2CV wheel arch leading edge maked up and undercoated

With all of that done, this area is now much better protected than when it left the factory, hopefully that should put a crimp in the style of the tin worm which was close to getting established in places.

2CV near side wheel arch

2CV off side wheel arch