After riveting the top skin I noted some winkles that were not visible when the clecos were in.
Winkle where the inboard and outboard skin meet:
I removed some rivets and cleaned the inside of the wing with a vacuum cleaner.
Next was relaxing the skin and insert the clecos:
There is a small gap where I created the cutout for the conflicting rivet:
This was a good time to insert some epoxy primer to fill the gap: