From wet to dry, silk does not shrink a whole lot. So get it on looking to suit you while it is still wet. Silkspan shrinks more, I think, and will shrink a little more on rewetting. Even so, do as perfect a job initially as you can. One tip, let the wet silk or silkspan dry naturally. Don't get impatient and use your hair drier. It will shrink, and then go baggy. Dope is a thermoplastic and you can heat a wing to get a warp our or heat a small wrinkle out. I've dropped something on silk or silkspan and dented it, and with a hair drier pulled the dent out.

One other thing, when I have a wet wing ready to dry I see to it that both sides are equally wet, and I position it vertically, else the top will dry faster and you may get a warp. When doping, I dope both sides equally, back and forth, for the same reason.

One thing I do with an open structure, is to make small holes in the ribs, etc, and a small opening to the outside in an inconspicuous, oil-free place. So when sitting out in the sun and heating up, hot air is not sealed in and trying to stretch the covering.