acoat of buterate clear dope around the edges of the wing etc. let it dry then drape the damp silk and carefully "stretch" it lover and paint over the edges again. no heat. this is a natural thing,,,not plastic,,,hehe. buterate dope will seal it and it will bw tight. for life give it a few coates of silver until light wont shine through it. the sun will "rot" it in short order.