Wing - Fiberglass
I finished the left wing tip today. Well, as far as drilling, filing, nutplates, etc. I still need to paint, but that's another day.
A few days ago, I epoxied the strip of nutplates for the top wing tip screws to the inside of the wing tip. Today, I screwed the wing tip to the wing, and I had a few problems. When I pushed down a little too hard while screwing the wing tip to the wing, the strip of nutplates come loose in a few places. There was not enough epoxy under the strip, and I had not added any epoxy to the edges of the strip, like I had planned to do. This was fixed by gluing the strip back down, and adding some more epoxy along the edges. This seems to be holding ok, but there is a better way.
It turns out that I was wrong about not wanting to rivet the nutplates directly to the fiberglass tip. After the problems with the top strip of nutplates, I decided to try and rivet a nutplate directly to the edge of the fiberglass wing tip, just like the instructions said to do. Since there was no cracking on the first nutplate, I decided to do the whole bottom strip like this. This method took about half as much time as riveting the nutplates to a separate strip of aluminum, and it works a whole lot better.