I started my first starch applique project 2 weeks ago and I am using Niagra NON AEROSOL original spray starch ( like Irishrose above) . I just pour a little in a cup.I don't dilute it though. Never thought of it...but might now try it :) It works ok. I too want to try Mary Ellen's but the only place I found to buy it locally is expensive and in a scent I would find unpleasant. I may buy from Amazon just to give it a try.
It's a great method though. I can see myself doing more applique now that I've tried this.