To prevent delamination, run a bead of white glue over the edges.
This strengthens the outside edges and helps round out the square sides even more.
This is one of the edges after smoothing out the bead of glue.
You can see how the bead will dry and leave a rounded side.
You don't want a bead of glue on the root edges of the fins. Keep the root edges square.
After the glue bead dries, lightly sand and smooth the glue edge.
Repeat with another bead of glue if necessary.
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