I wouldn't try that method either--to risky!!! To block acrylic it needs heat, I use a small hand held steamer (steam iron would work) & hold it against couple inches from the item, smooth with your hand & pin if necessary to pattern directions. Let dry. It only takes a couple seconds of steam to uncurl an edge etc so don't linger over an area to long.
I have just been putting them in the dryer. They look really good.