After sanding off the paper from the sides there will be a raised paper lip around the edges.
Lightly sand off the lip with 400 grit.
The open balsa edges will need to be filled.
Brush on thinned CWF keeping the filler just on the exposed balsa.
There will be some overlap onto the sides.
here in the inset picture I'm wiping off the filler. You don't want to be sanding the papered flat sides, that'll raise too many paper fibers.
After sanding all parts got a coat of gray primer / filler and sanding.
I used 20 lb. copy paper to cover the fins. Without sealing with the primer coat the fins sides would look rough.
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