There are a couple of different kinds of
heavy water-soluble stabilizer. One is clear and plastic, and that brand
is Sulky Ultra Solvy. The other is soft and fibrous, called Vilene.
Both will work very well. Vilene is used in this demonstration.
Use a size
11 or 75/11 sharp sewing needle. A sharp sewing needle has a
smaller, finer point than an embroidery needle. That means it will
make smaller holes in the stabilizer.