M. Michael Meyer & sackingsfan,
Most trainers don't use fiberglass tape to join the wing halves together. While it definitely won't hurt to do it, you will be ok if you don't do it. Trainers just don't produce the wing stressing loads that can snap other wings, thus needing the fiberglass to strengthened the wing joint. If you use epoxy to join the wings you will be just fine, IMHO

Hope this helps

Ken