When repairing an open structure wing decide how far you are going to need to cut back the covering. Iron down the covering to the ribs in that area to avoid having it pull back. When you cut back the covering leave a small lip (1/4 inch maybe) INSIDE the hole for ironing down to the ribs/structure. Apply the patch and have it extend past the rib slightly. Color match as well as you can OR add an accent stripe?