Judy, I use this technique as well but round my corners. I'm not sure if you're applying it to a square corner quilt or not.
I use a method similar to the F&P post just a couple days ago and can look it up for you if you're not sure how to make continuous bias binding.
Once I have my giant strip, I fold it in half and press the full length. You'll have one finished edge and 2 raw edges together. I am very careful with the fabric at this point to maintain a consistent width. After I have about 2 lengths of the ironing board done and it is completely dry, I use a cereal box cut into a rectangle I can work with pretty easily and I gently fold it around the cardboard. When I apply it to the quilt, I unwind a workable amount off the card and keep the rest on the board with a long straight pin through the rows of binding. It works great. The first time or two takes a bit getting used to, but I love this method and always make A LOT of binding if I'm taking the time to do it.
I hope this helps. :D