Cant beat good ole Dope based balsa sealer. My latest build with no primer, just colors. Not perfect, but good enough to fly. Oops, forgot to mention the process. Simple and fast, shaped and sanded fins smooth. Then I brush on one coat of Brodak sealer, let dry 20 min and brush on second coat. I let this dry 45 min and sand smooth and that is it. Since this new balsa is pretty hard I normally don't have to brush on another coat.

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