[QUOTE= or can also shrink fabric due to the moisture and heat--which makes sense since using it on a quilt with cupping problems before quilting helps tame the cupping by shrinking it. Has anyone else heard this?[/QUOTE]
I have never heard of "cupping" problems. What is this?
It makes sense about shrinking the material when steam ironing, as that is what you do when wash and dry it in the dryer. But, now that you mention this, it is certainly an "AH Ha" moment for me.