Originally Posted by Prism99

Sizing is made out of chemicals. Starch is made from organic material -- for example, rice, potatoes, corn, etc.

Sizing is limited as to how much stiffening it can provide; it is similar to a light starch solution in that respect. Heavy starch solutions can provide a lot more stiffening and stabilizing of fabric than sizing can.

I use a heavy starch solution (1:1 solution of Sta-Flo liquid laundry starch and water) on fabric before cutting into bias strips and also before cutting background squares for machine applique (starch eliminates the need for using a stabilizer underneath the background fabric). No matter how many layers of sizing is used, it would not be able to achieve this level of stabilization of fabric.