Here is a link to a review about the Fusible Piping....
http://quirksltd.wordpress.com/
My thoughts on it were the same as the Batting tape you can buy...Why...this is even easier and cheaper to make yourself..
simply buy stitch witchery fusible web..it is a NON-paper backed fusible web. There is another one available, but it is really spendy and not necessary for this project.
Cut your SW into the size strips needed to cover your piping and allow for the 1/2" flange you will press your fabric to.
then fold the SW over your piping and stitch down using your zipper foot so it is nice and close the piping...
you can do miles of this stuff in minutes....and because SW is fusible on both sides, you don't have to worry about where the fusible side is.. Then when you need it, all you have to do is fold your fabric strips over it, press them and off you go!
SW is very thin and pliable, so it won't make your piping stiff.