Spray size (not starch) will make a huge difference in your quilting.  Before, I used sizing, my quilt blocks would always come out small.  This was not due to my 1/4″ seam, it was a scant and not a true 1/4″.  I no longer wash my fabrics.  I think companies have figured the bleeding out, but I also do not do anything using white or really light fabrics, so i am safe…if i for some reason would I use white Iwould test the fabrics.  So because I don’t pre wash what was happening is my fabrics were shrinking because i use lots of steam when I iron as i was making blocks.  They shrink ever so little but by the time your block is together you have lost 1/4 to 1/2″ on your blocks.  So how does the size come in…BEFORE  you do any cutting.  Spray size your fabric, spray it good and then iron it dry.  This helps pre-shrink your fabric NOW before you cut your strips or pieces.  Now you have it all shrunk up, you have added more size to the fabric, it will now cut and piece nicely.  Then here’s the added bonus….I have always envied my friend Carole’s quilt tops, they do not have all those little strings on the back…the SIZE also helps with that too!  Carole is the queen of sizing, she buy six cans at a time….I am going to the store right now to buy my six, because it sure stinks to run out in the middle of a big quilt!  So give it a try and let us know if you agree…size matters