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Did some cleaning up under the bonnet, sprayed over the linished welds with a zinc rich primer. I made some small repair patches for the edge of the front wing and front panel, then primed these repairs too.
I've test fitted the wing and it looks good to go back on, but I'm going to order some Bilt Hamber products, including a weld-through primer so I can prime the various flanges before I weld them back up: It helps seal out any corrosion and means the repairs will last a long time.
I think I might clean off the underseal from the inner wing while the outer wing is off. Then I can prime it all with the zinc rich primer: It'll delay me putting the wing back on, but I think the end result will be much better. It's not like the car is going to be used as a daily driver, but modern stone chip on top of modern primers is going to be more durable than the original 1979 stuff.
Pictures from today, wing rail linished and primed:
From the other side:
Close up of the front panel edge after 7 years bare metal in the garage, not too bad considering. I had to cut the spot welded flanges off the panel and the matching wing edge due to access.
Repaired the flange (needs final trimming, but primed it to prevent surface rusting):
I think a lot of the work is going to be cleaning up surface rust, treating it and then using the zinc rich primer to protect it. If you look at the pillar where the rear edge of the wing bolts on, this an example of light surface rust (it's exactly as it was when I took the wing off 7 years ago). Many RS2000s of this age would be completely rotten in these areas, so I'm grateful it's just these two strut top areas that have rusted through.
Same for the bulkhead seen in the back of this photo. This is normally covered by the sound deadening pad (which traps water so the panel is often rusted through):
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