Get an iron sock on the iron and over sheeted surfaces apply firm pressure while making small circles. Be patient and start at the outside of the wrinkle, it will suddenly start to stick and you keep moving toward the center. You can use the pin method if needed but usually this will work on it's own. The gun should be reserved for open areas like wing bays. If you do use the gun for curved surfaces like wing tips have a cotton glove on your hand to press the covering down as you go.