Double gluing is a way of strengthening your fins. You want your fins to be strong so they don't break off when they land or especially when they are in the air. The first step of double gluing is to glue the fins and then you let them dry. Glue them a second time and let them dry again. When you are double gluing you have to smear the glue into the cracks of your fins so that they stays strong. Then you're ready to launch.
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