Originally Posted by
illinois
So what does a person use Heat'n'Bond for? I'm not familiar with this product.
If you sew pieces of several T-shirts together, they would not end up square, as the fabric is so stretchy it would never stay where you want it. So you take some kind of interfacing and iron it onto the back of that knit fabric. Now it feels and acts as if you were using quilting cotton. That's what you want. Sometimes an interfacing is ironed onto the back of an appliqued piece; wherever a little more stiffness is desired in the fabric.
One by one has a link that shows many different kinds of interfacing.
Also, see Stitchnripper's post above and check out the link.
Apparently my LQS didn't know there were different grades of HeatnBond. They are more of a craft place but sell many things quilters use.