I also glued the joined cover on to the main fin spar. I wanted to be able to precisely locate the spar on the cover while gluing to make sure I could do it when I close the forward fin spar that is already varnished inside. Since I'm using the weight method for clamping the cover to the spar while the glue dries, the glue tends to make the spar slip around a little. To keep it where I wanted it, I used some nails through the extra plywood along the outside of the spar in some key places. That held the spar in its location as the weight was applied. Worked like a charm.
The failure of the penacolite test block really freaked me out so I figured I had better run a test on the Aerolite as well. I glued up the test block with the same batch that I used with the main fin spar cover.
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