After the fins are glued in place with white glue, Titebond M&TG is used for the fillets.
If you use the right amount of pressure and apply the right amount of glue, the fillet should be pretty even right out of the bottle.
The inset picture show the glue fillet smoothed out using a fingertip.
Many builders forget about the front leading edge tip of the fin.
Roll some glue around the tip joint and smooth with a fingertip.
The back end root edge joint also needs some extra glue set into the seam. You can use a Q-tip to pick up the excess if it is too hard to reach.
Check out the tube wall thickness of the ST-10 and ST-7 tubes. SO MUCH STRONGER than the Estes BT-50 and BT-20 tubes.
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