Just 3 coats of primer sanding it down between coats. I filled the spirals one time ever on a rocket...maybe i’m just being lazy but felt it was too much work for what it’s worth, for me. I enjoy the builds, hate filling/sanding fins but it is worth the effort. Too much fuss becomes not fun for me. If someone has an easy tip for filling the spirals with a great result I might start doing it.

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