Here I've stuck them down to masking tape, the sticky side of the tape is up.
TIP: Before setting the tape on the spray board, set the tape on your pant leg and remove. This picks up some denim fibers and diminishes the stickiness of the tape a little. If the tape is less sticky, it won't pull the filler out of the balsa grain when you pull up the fins.
After both sides of the fins were sprayed, here's how they looked.
I tend to spray one (heavier than most would) coat of primer/filler, and sand almost to surface.
It's hard to see the sanded taper line running vertically in the picture.
It's there, but very subtle.
Even the primer/filler will help define the high points of the tapers.
In the picture you can see how the primer is darker at the tops of the tapers.
Try to sand and leave a bit of the primer to keep the lines sharp.
On this fin, my sanded taper wasn't straight.
I sanded down opposite sides trying to get the taper line to run vertically.
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