Tales of the Rustmera continue...
Took it round to Ed's yesterday afternoon with a view to treating and preserving the rear chassis. After taking a look and getting a wire brush onto the particularly bad bits, we ended up with this...
There is bare metal, but also some big holes where the subframe is supposed to meet the chassis leg. There's also the slightly worrying crack running across the smaller hole in the chassis. And it didn't end there. This happened when I pushed on one of the plates that sit behind the rear bumper on the corner of the car.
We didn't bother with the wire brush on that part, for obvious reasons. Eventually we ended up with a pile of rotten underseal and bits of chassis. My car now is about 2kg lighter because of it.
So at this point it's obvious that the corrosion is more than just surface rust. Ed also had concerns about the state of my sills. Realistically I'm going to have to get a quote for welding, and then make a decision as to whether I want to go through with the expense, or can it. In the mean time, Ed broke out the Dinitrol and went about covering all of the affected areas. I've used Hammerite "Krust" on small body areas before, but as Ed said, Dinitrol is "like Krust on crack". It's proper stuff. It leaves a gloss finish making it look as though you've lacquered the underside of your car. Here's the area in the first photo treated...
And a before and after on the end of the offside leg above the back box...
At the very least, it's now covered and should fair the winter better than if it had been left. Obviously it by no means fixed, but it gives me a bit of time to consider my options. Would anyone that's had similar work done before have an idea of what it would cost? I know it's impossible to say from just seeing a couple of photos, but just to get a rough idea.
Also, just to say, huge thanks to Ed for all the help on this, and for using his Dinitrol. It's massively appreciated, as always!