I thought it might be useful to post a few images here concerning the recent repairs I made to our aging C8!
The MoT tester noticed that the O/S sill was going rather thin at last year's MoT; not thin enough to fail but it was weaken to a point where I needed to look at it and effect a repair before this year's MoT. This was a bit of a surprise to me as I though the C8s were fairly well rustproofed and if any part of the bodywork would fail, it would likely be the N/S - the side nearest the verge, where all the water an mud sits in the road.
Upon investigation after a pressure wash, I noticed that on the O/S there seemed to be a finger-sized entry point for crud to get in where the layers of sill metalwork meet the rear arch. The body sealant was present and complete on the N/S but not on the O/S, hence the hole through into the sill. So over time, water, mud and detritus and had corroded the sill from the inside out. All that was left was a paper thin layer of steel, masked completely by the original paint!
Anyone with a C8 reading this might take a moment to check their wheelarch sealant is there and doing the job as intended!
Here are some photos of my repair. I haven't painted it yet as it's too cold outside at the moment. Will also 'XCP Rust Blocker' spray the insides of the sills with a lance in the summer for extra corrosion protection.
Hopefully this will keep the old girl rolling for a while yet!
All the best,
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Well done, it would be good to do the interior with liquid wax.