Cut the fin covering paper closer to the fins but don't get too close to the balsa edges.
Let the fins dry overnight in a heavy book before trimming.
You could use a sharp knife to trim the fins but I used scissors.
Careful - It's easy to cut too close and take off some balsa.
On the top is a trimmed new Big Girtha fin.
After trimming close, CA was applied with a Q-tip. This hardens up the edges and makes the last of the paper overlap easier to sand off.
Don't put CA on the root edge! A CA sealed edge won't accept white glue as well.
The bottom inset picture is one of the older Big Girtha fins.
I didn't fill the balsa grain before covering on the first build. You can see some of the grain showing through on the reflected area.
In the end, the leading edge is rounded, all the other edges are square.
The exposed balsa edges will need to be filled and sanded smooth.
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