Franticaly trying to get several lap quilts done before the holidays. Hate using the marking pens so decided to try water soluable interfacing and I love it. I trace the pattern using a pen, pin it on the quilt block, and away I go. When I'm done with the quilt, just toss it into the machine and everything is gone. Not sure how this would work for hand quilting but great for machine quilting.
I found it at JoAnns and you can buy it by the package or the yard. Best to keep it in a zip lock freezer bag away from humidity.