Or, if your using Rocketpoxy or Proline 4500, when the resin gets to the stiff stage when you would normally pull your fillets smooth, use a little motion and it should make a pattern. Probably take a little practice. I agree, it would probably look cool. Especially if you were doing a steampunk model...
This is possible, but boy, you'd have to have perfect timing so you had no stickiness fairly deep into the cured surface.
I'd probably go with epoxy clay and roll out little extended football shapes then lay into fin joint and tamp down carefully.
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