C/A & epoxy work well. I've had good luck using fiberglass cloth & resin on wing joints. You can mix the resin "hot" if you're in a hurry, or use less hardener for the strongest adhesion. I guarantee you it's easier to sand than C/A or epoxy. It flows on like a dream & you can use a brush to "put it" where you want. I have cartwheeled a plane down the runway, the wing broke at the edge of the fiberglass. Try it , you"ll like it.