I usually spray and let sit for a minute or two before ironing. There is no long soak time unless you get the fabric very wet. I soaked a fat quarter when I first used the spray and it could stand upright without falling over. LOL This is a great demo for your guild. Spray a ten inch square and press using starch. Let members feel it. OK it's starched fabric. Then let them feel a ten inch square pressed with Terial spray. The it's OH MY Goodness! What is that called again? LOL