I've even used multiple layers of 3/4 oz cloth. Start with a 1" wide strip in the middle and add layers (while still wet). Each layer is cut a little wider than the next until you get the number of layers and width you want. Cut all of them ahead of time and lay out in order. This way you have 5 or 6 layers thick at the joint for strength, and it tapers to very thin single layer at the edge. I also use masking tape chordwise spaced about an inch further out on the wing than the widest fiberglass pieice and paint the epoxy all the way out to the line. Remove the tape while the eopxy is still wet and the edge will lay down to a nice smooth transition. With a little light sanding, and covering, you can't even tell it is there!

Richard
Tomball, TX