This was kind of a milestone day. I was able to get the left wing closed out completely. It is impressive how the wing as a skeleton was very flimsy and flexible and now that it is skinned it is very rigid and strong, The onle skin that needs installed on the left wing is the wing walk double. It makes sense to prime the area under the doubler for corosion resistance. However I wish i would have known about the earlier in the build and I would have done it at a different time.