CModel, try taking a piece of monokote about 2" larger all around compared to the area you are covering, adhere it to the edge of the wing first, keeping at least a quarter of Monokote at the edge, then pull it by hand down to the center edge of the wing and all around the edges, for myself the secret here is to keep the heat off the Monokote that you are putting on, Just enough heat to stick it to the edges. Making sure all the edges are adhered, use a heat gun and keep it fairly far away just enough to start seeing the wrinkles go away, they will continue to go away even after the heat is taken away. Patience is the key here. Try not to shrink the Monokoe with the iron when putting it on, so that when you are ready to use the heat gun, you will have all the shrinkability the monokote has to offer, because you have not used it up until the heat gun is applied, Bob.