i too use Magic spray sizing on every piece of fabric before I begin to cut. Spray and iron back and forth, up and down, sideways....I want that fabric to shink now and not after I cut pieces. I lightly spray as I am pressing pieces that have been sewn together and spray again as blocks are being joined. I also spray and iron the backing fabric...back and forth,etc. for a lap/baby size quilt, I use at least 1/2 a can.....I just finished a King that used 2 full cans. Walmart carries the blue can ( light sizing ) for 97 cents and my grocery store carries the green can ( heavy sizing ) for about double the price. I like it best on Batiks but the blue does OK too. I have some quilts that have been washed and dryed several times that have maybe 5 percent shrinkage...from the batting that I do not pre-treat and I like the old fashioned look!!