Bob - Fancy meeting you over here... Try some 3M Strapping tape. You will be very surprised at the strength it adds. Add 2 tape "spars" top and bottom. One at about 25% chord, and one at 75% chord. Set the wing down on a table, mark the spar locations, cut the tape about 4" longer than what you need. Then pull the tape tight with both hands, lay the tape on the wing, rub it down well. Then do the other tape spar on the same side (ie 2 on top) The core will bow up a bit from the tension of the tape. Don't worry... Turn over the wing and do the same thing on the bottom. The tension on the bottom spars will pull the wing flat again. This method works great and it adds almost no weight. You will be VERY surprised at how strong the bare foam is now. Here is a pic of the Edge 540T he is talking about.

Tim H.