I still had to prepare and prime the new left wing rib 6 and 12.
I had to de-rivet some parts from the old rib 6 and had to make the bushing fit by enlarging the hole with the mini SkotchBrite wheel on an accu drill.
I reordered new angles for the left wing to bend the step for better alignment with the rear spar.
After all parts where prepared I could prime them with wash primer.