I worked in the cowl again this weekend. It seems I'm done with trimming now and I could work on connecting the two halves on their sides with another set of piano hinges - if it wasn't for the gap I had created on the left side.
My first attempt to fix this was by clamping a back plate in place (another strip of fiberglass) and filling the recess with resin with a lot of flox mixed in.
The back plate had its slick side facing the resin and I also applied some wax on it so I could easily separate the cured resin from the backplate. The lower area of the cowl beneath the gap was covered with a strip of packing tape.
The setup cured ok over night and I was also able to separate it without any damages. Unfortunately, I had a sag that needed filling from the inside of the cowl area, so I sanded the resin and applied some more floxed resin.
Once this is all set, I hope it has enough strength to hold onto the small area of contact with the rest of the cowl while I trim it back to the correct shape. When the piano hinge is installed, it will help to stabilize the gap filler but before that happens it will be rather fragile.
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