Guys, fold the mono/ultra-cote back on itself to form a crease. Clean the slot between the wing and the aileron with alcohol. Place the folded over mono/utra-cote in the slot and iron on. I use one of the thin SS rulers to hold the mono/ultra-cote down in the slot as I iron it on. I then take a long razor knife and trim the leftover covering flush. I have gotten in the habit now of sealing both sides to keep the crap out. While you are at it why not do the rudder and elevator. You might also want to do a search on here for something like sealing hinge gaps. Lots of good info already written.
Hope this helps
Ed M.