And I'd add "work in a well ventilated area". The stuff smells downright nasty. The instructions for the Diehl wing skins are at http://www.diehlaero.com/wings.htm and you should download them and read them carefully if you haven't already. It's not unusual for Diehl skins to separate at the resin joint if the wrong resin is used, so definitely use VE, and do it by the directions. I would think some roughing up and a throrough cleaning of the area to be bonded would be in order, but then it's been years since I've read the directions myself.
Mark Langford N56ML "at" hiwaay.net website at http://www.N56ML.com