My friend had made a t-shirt quilt top and took it to a longarmer to have it quilted. She wanted Minky on the back, and all was ready to go. Longarmer took one look and sent her home with it, would not touch it BECAUSE she did not stabilize it! She said it will stretch out and bag and pucker, and she won't do it. Now my friend is cutting the stabilizer as accurately as possible to iron to the back of the top after the whole thing is already assembled. I applaud those that have had good luck with out the iron on backing, and I do believe a rag quilt or jean quilt would not require it, but the majority should do better with it. JMHO