This doesn't normally happen doing my regular two-step balsa filling practice.
After the filler/primer dried there were a few balsa grain pores left. I rubbed some CWF into the pores and sanded it to surface at the same time I took down the filler/primer.
The fin tab fit was a little long. There is a gap at the root edge.
In the picture I've marked the area with a pencil that will be sanded down. Sand a little, check the fit then sand a little more.
On the booster body tube the filler/primer has been scraped down to the rough tube for a better glue bond.
NOTE: The primer has been scraped where the glue fillet be down the root edge joint.
The booster fin fit is much better. This is a dry fit before gluing the fin tabs to the interior motor mount tube.
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