
I have had so many people ask me for more details regarding starching fabrics prior to cutting them out. I will be happy to share with you what my process is, where I got the idea to do it, and why it is working out well for me.

First of all, I do this outside on a sunny day. I spread a towel on my outside table and lay out my fat quarters one at a time. You can also do this process very easily with layer cake squares or charm squares. What I use for the process is cans of inexpensive spray starch from the grocery store. I have tried both Niagra and Faultless, and prefer Faultless. Faultless seems to spray more evenly with less foaming. You will go through these cans of starch like nobody's business. A fat quarter bundle could take 3 cans. Your finger will get tired of pressing the nozzle, so I recommend a detachable spray paint handle that you can get at any hardware store. It just pops on the top of the can and makes spraying a lot easier.
The starch cans are piling up in my recycling bin and I am now on the hunt for jugs of spray starch like Grandma used to use, which can be diluted with water and would be far more economical than these silly cans. I would mix up the starch in a basin and dip my fabric pieces in it. You want to fully saturate the fabric with starch. Soaking wet is what you want.
Once the piece is fully wet with starch, you want to air dry it. Don't put it in the dryer for goodness sake. That would result in softer pieces of fabric and negate the effect of all the starch you just infused into the fabric. Hang it on a clothes line, or a drying rack, such as the one in the photo above. If it is a nice day, your fabric will dry in a jiffy. You want it to completely air dry. Don't cheat and try to hasten the process with your iron. if you did it right, when dry, you will have pieces of fabric that will stand up on their own, they are so stiff. Like lightweight cardboard.
Take your dried pieces in the house and now press them out nice and flat with your iron. I use steam. I fold the fat quarters nicely and am good to go whenever it is time to cut things out.
Someone asked if I prewash my fat quarters or precuts prior to starching. Good heaven's no. Someone else asked about shrinkage. I have noticed the slightest bit of shrinkage when pre-starching and air drying. Barely noticeable. Insignificant. Another reader asked if Spray Sizing would work. I suppose so, but you may not get as stiff/crisp results. I think sizing spray may be more expensive than spray starch. Mary Ellen's Best Press is a very nice product, but you will go broke if you try to use it for this method I am describing.
I got the idea to spray starch my fabrics prior to cutting from Lisa Bongean of Primitive Gatherings. She has a tutorial on how she does it and I pretty much just copied her. She also did an excellent YouTube video for Fatquartershop.com on her method, which I recommend you watch.
Why would anyone go to this trouble of pre-starching fabrics prior to cutting?
Once you try this, you won't go back to cutting and sewing unstarched fabric. The starched pieces are a breeze to cut out. The fabric doesn't shift, it stays put while you run your rotary cutter through it. You will get a more accurate cut, and that is a fundamental component of successful piecing. Start out with an accurate and precisely cut unit and half your battle is won.
So if you find cutting starched fabrics is wonderful, just wait until you start stitching your starched fabric units. If you are stitching bias edges, the starching seems to keep these stretchy edges under much better control. Your stitching, whether on the grain, against the grain or on a bias edge will be much more precise. You will be amazed. Your fabric will stay put, not stretch and be completely under your control. Furthermore, if you are working with tiny pieces, you will love how much more accurate your stitching is and how well your units go together.
I am a total convert. It is a time consuming step when you are itching to jump in and cut out that fat quarter bundle, but believe me, you will be glad you took the time to pre-starch once you give it a try.
Great discussion and tips from commenters, be sure to read below. Also, check out this link Annie provided:
http://www.generations-quilt-patterns.com/starch-quilt-fabric.html
It is a wonderfully informative piece.