Hi, I got some Imprintables Faux Twill the other day and I seem to have a problem when I pull the covering off. It leaves a thin white, like glue on the twill. Sometimes it starts fine and then it will leave behind the glue. I have yet to pull it off and get a clean number. Its hard to describe and very frustrating. Its not working like other vinyl substrates. I am also following the directions, 320 @ 15-20 seconds, cold peel, I have done every second as a test but its all the same. Could I have gotton a bad roll? Any suggestions??