I have found that some of the sizing prevents the starch from soaking in very well.
Some I have to spray once, others 2-3 times to get it stiffer when needed.
I use steam only if the fabric has completely dried, and the fabric is fairly stiff.
If you are actually "ironing" with steam on non/lightly starched fabric, and not "pressing" it, you can cause the grain to distort. :wink: