I had to look back through the blog to remember how bad it was rusted and the poor attempt to repair it.
Which all needed to be cut out
You can see the damage behind which was all fixed a year ago in this post: Left-hand-rear-wheel-arch-repairs
Certainly looks a lot better now behind the wing, which leaves the next job of lining up the new replacement panel.
Needed the usual preparation of weld through primer and holes for the welding.
Then make sure it lined up ok. This took quite a bit of fine adjustment with the angle grinder to make sure that the panel fitted just right, but also left a small gap between the new and original metal to weld into. About 1mm to 2mm is normally about right.
And then it was time to weld it all and grind to a smooth finish.
It will certainly need a thin coat of filler to make perfect but considering the extent of the damage I'm very happy with this result.